Spinach pipefish
Microphis spinachioides
The Spinach pipefish exhibits a long, slender body with greenish-brown color and distinctive, elongated snout, blending well with seagrass habitats.
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About the Spinach pipefish
This is a freshwater pipefish from Papua New Guinea - basically a tiny river cousin of seahorses with that stiff, armored "stick" body and a little tube snout for picking off micro-crustaceans. The really wild part is the males brood the eggs, and the species is so rarely seen in the wild that a lot of info we normally lean on for aquarium care just straight-up is not documented.
Also known as
Quick Facts
Size
15 cm SL
Temperament
Peaceful
Difficulty
Expert
Min Tank Size
20 gallons
Lifespan
2-5 years
Origin
Oceania (Papua New Guinea)
Diet
Carnivore (micropredator) - live/frozen micro-crustaceans like copepods, daphnia, baby brine, small shrimp
Water Parameters
24-28°C
6.5-7.5
2-12 dGH
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This species needs 24-28°C in a 20 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Give them a long tank (30+ gallons) with gentle flow and lots of skinny plants/roots to wrap around - they stress out in bare tanks and get pushed around by strong current.
- Keep it warm and steady: 75-80F, pH around 6.5-7.5, and low nitrates (try to keep it under ~20 ppm). They crash fast when water quality swings, so small frequent water changes beat big sporadic ones.
- Feeding is the make-or-break: live foods like copepods, daphnia, baby/juvenile shrimp, and blackworms get the best response, and you will need to offer food multiple times a day.
- Most wont take dry food; if you want to train them, start with live, then mix in frozen cyclops/mysis and target feed with a pipette right in front of their snout.
- Avoid fast or nippy tankmates (tetras that peck, barbs, gouramis, cichlids) and anything that will outcompete them at feeding time. Good company is tiny, calm stuff like small rasboras or better yet a species tank with shrimp and snails.
- Cover every intake with a sponge and block tight gaps - they love getting into corners and will get sucked in or scraped up. A dark, quiet tank with lots of cover makes them way less flighty.
- Watch for skinny bellies and weak hunting behavior - that usually means they are not getting enough live food, not that they are sick. Also keep an eye out for snout damage and fungus after they bump decor or get harassed.
- Breeding is cool: the male carries the eggs, but you will only get fry if you can supply clouds of tiny live foods (copepod nauplii, rotifers, baby brine as they size up). Fry are basically microscopic vacuum cleaners that starve fast if the tank is not crawling with food.
Compatibility
Good Tankmates
- Small, chill schooling fish that stay out of their face - ember tetras, green neon tetras, glowlight tetras. They are calm enough that the pipefish can cruise and hunt without getting shoved off food.
- Tiny rasboras that are mellow and not bitey - chili rasboras, harlequin rasboras, lambchop rasboras. Good midwater neighbors as long as you keep the flow reasonable and feed the pipefish first.
- Peaceful bottom crew that will not hassle them - Corydoras (pygmy or regular), small Otocinclus groups. They do their own thing and do not compete too hard at the surface.
- Gentle algae and film pickers like hillstream loaches (in a tank that matches their needs) - they stick to rocks and glass and usually ignore pipefish completely.
- Small, non-territorial livebearers in calmer setups - Endler-type livebearers can work if they are not in crazy high numbers. Keep it light so the pipefish is not constantly outcompeted at feeding time.
Avoid
- Anything nippy - tiger barbs, serpae tetras, many danios in a hyper mood. Pipefish get stressed fast when stuff is constantly zipping and pecking around them.
- Fin and body pickers like many gouramis (especially more territorial ones) and bettas - they can decide that long skinny pipefish are a target and start harassing them.
- Big mouths or pushy cichlids - angels when grown, convicts, most Africans, even 'peaceful' midsize cichlids. If it can fit a pipefish or bully it off food, it is a no.
Where they come from
Spinach pipefish (Microphis spinachioides) show up in slow freshwater and lowland waterways in Southeast Asia. Think weedy margins, submerged grass, roots, and leaf litter - places where you can barely see them until they move. They are basically freshwater seahorse cousins, just longer, faster, and way more shy.
If you have only ever kept "regular" community fish, pipefish feel like they are from a different hobby. They do not compete well for food, they stress easily, and they punish sloppy maintenance.
Setting up their tank
Give them a calm, planted tank with lots of vertical structure. I have had the best luck in taller setups where they can cruise and hover without being forced into tight turns. Long tanks work too, but avoid busy hardscape that makes them constantly dodge.
Flow should be gentle to moderate, not a river. You want enough circulation that food does not rot in dead spots, but not so much that the fish spend all day fighting current. Sponge filters and a spray bar are your friends here.
- Tank size: I would not bother under 20 gallons, and 30+ gallons makes life easier (more stable and more feeding room).
- Aquascape: dense plants (real or high quality artificial), fine-leaf stuff, floating cover, and lots of "tangle" like roots or branching wood.
- Substrate: sand or fine gravel so uneaten food is easy to siphon.
- Lighting: moderate with shaded areas. They act braver with floaters.
- Lid: tight. They can jump when startled.
Add "hitching" spots even though they do not always use them like seahorses. Clumps of moss, guppy grass, or a bundle of plastic plants give them a place to pause and feel hidden.
Water-wise, stability beats chasing a magic number. Neutral-ish pH is fine, slightly acidic is fine, but big swings are not. Keep it clean, keep it oxygenated, and keep nitrate low. I do small, frequent water changes rather than big ones, because sudden shifts can spook them into not eating.
Do not toss them into a brand new tank. They do way better in a tank that has been running a while with a mature biofilter and a healthy microfauna population.
What to feed them
Feeding is the whole game with spinach pipefish. They are visual, picky micro-predators that want small moving prey. Mine ignored flakes and most pellets like they were rocks. If you cannot commit to live and frozen foods (and the extra cleanup), this species will make you miserable.
- Best starters: live baby brine shrimp (BBS), live daphnia, live copepods, live blackworms (use carefully).
- Frozen that often works once they settle: cyclops, baby brine shrimp, chopped mysis (tiny pieces), finely chopped bloodworms (not as a staple).
- Foods that usually fail: flakes, big pellets, and chunky frozen foods.
I get the best feeding response by target-feeding with a turkey baster or pipette. Turn off the filter for 10-15 minutes, squirt a small cloud near their favorite plant clump, and let them pick. If you broadcast feed in a community tank, faster fish will steal everything and the pipefish will slowly fade.
Watch body condition. A pipefish can look "fine" right up until it is too late. You want a gently rounded belly after meals, not a pinched look along the abdomen. If they are not eating with enthusiasm, treat that like an emergency.
How they behave and who they get along with
They are peaceful, shy, and easily intimidated. Most of the day they glide around plants and pick at tiny prey. They do not want to spar, they do not want to compete, and they definitely do not want a tankmate that mistakes them for a snack.
- Good tankmates: calm nano fish that do not outcompete at feeding time (small rasboras can work), tiny peaceful catfish, snails, and shrimp (though small shrimp may become snacks).
- Bad tankmates: anything nippy (barbs, many tetras), boisterous feeders, cichlids, gouramis that like to investigate, and anything big enough to mouth them.
- Best setup: species-only, or a very carefully chosen quiet community with a dedicated feeding plan.
If you really want tankmates, feed the other fish first at one end, then target-feed the pipefish at the other end with the pumps off. It is extra work, but it is the difference between "they survived" and "they actually eat."
Breeding tips
Pipefish are in the same weird club as seahorses: the male carries the eggs. If you get a settled pair and you are feeding heavy live foods, courtship can happen without you doing anything fancy. You will see more following behavior, tighter side-by-side swimming, and the male getting noticeably "full" in the brooding area.
Raising the young is where most attempts crash. The fry are tiny and need tiny live food basically on tap. If you have not already raised fussy fry (or run rotifers/copepods cultures), plan on learning fast.
- Conditioning: lots of small live feedings daily beats one big meal.
- Cover: dense plants and calm flow reduce stress during courtship.
- Fry food: copepods and newly hatched brine shrimp are the usual starting point; have cultures ready before you see pregnancy.
- Separation: consider a fry tank or at least a heavily planted "safe zone" because adults and tankmates will pick off babies.
Do not move a heavily pregnant male unless you have to. In my experience they can drop or lose the brood if they get stressed during transfers.
Common problems to watch for
Most losses come from slow starvation, shipping stress, or secondary infections after small injuries. They do not have much margin for error, and they do not bounce back like a hardy tetra.
- Not eating: the big one. Often caused by stress, too much competition, or offering the wrong size food.
- Snout issues: scraped snouts from hitting glass or hardscape can turn into infections fast.
- Internal parasites: wild-caught fish can come in thin and never gain weight even if they "eat."
- Bacterial infections: fin/body sores after stress or poor water quality.
- Gas bubble problems: can show up if water quality is poor or if they are chronically stressed (also seen in other syngnathids).
Quarantine is worth the hassle with pipefish. I keep QT calm: dim light, lots of fake plants, mature sponge filter, and I focus on getting them eating first before I start throwing meds around.
One more practical thing: clean up after feedings. Live and frozen microfoods foul water quickly, especially in planted tanks where you cannot see every corner. I do a quick siphon of the "feeding zone" and rinse prefilters often. That small routine keeps them from going downhill for no obvious reason.
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