Spotted spikefish

Where they come from

Spotted spikefish (Hollardia meadi) are deepwater marine puffer relatives from the western Atlantic and Gulf region. You will see them called "deepwater spikefish" sometimes, and that sums up the main challenge: they are not a reef-flat fish. They are built for cooler, dimmer water and a slower pace.

Setting up their tank

Think "cold-ish, calm, clean, and secure." These fish stress easily in bright, busy tanks, and stress is what starts the usual downhill slide (refusing food, infections, sudden losses).

• Tank size: I would not do one under 40-55 gallons. Bigger is easier because temp and water quality swing less.
• Temperature: aim cool compared to typical reef temps. A chiller is often part of the deal, depending on your room temp.
• Flow: moderate, not blasting. Give them areas where they can hang without fighting current.
• Lighting: subdued. If you run reef lights, give them shaded caves and overhangs.
• Aquascape: rockwork with real bolt-holes. They like to wedge in and watch.
• Filtration: oversized and stable. They are messy eaters and you will be feeding rich foods.
• Lid: tight. They can launch when spooked, especially at night or during acclimation.

I like to set them up in a species or "quiet predator" tank with a bare bottom or easy-to-clean substrate, at least at first. They are not gentle eaters, and the leftover bits can foul the tank fast if you have sand and lots of nooks collecting mush.

What to feed them

Food is usually the make-or-break point. Many arrive skinny and skeptical of prepared foods. Once they are eating with confidence, they are much easier. The goal is meaty marine foods, variety, and getting them onto something you can provide long term.

• Best starters: live ghost shrimp or live blackworms (rinsed well) can flip the switch for a picky new arrival.
• Frozen staples: mysis, chopped prawn, clam, squid, krill (sparingly), and quality frozen "marine carnivore" blends.
• Fresh options: finely chopped raw shrimp, scallop, or clam can work great if you freeze portions and rotate.
• Train to tongs: feed with long tweezers so they associate you with food and you can control portions.
• Hard foods: occasional shelled shrimp or small bits of clam help wear teeth a little, but do not treat them like a classic puffer that needs constant crunch.

Watch the belly line. You want a gently rounded look after meals, not pinched. These fish can look "fine" right up until they are too thin, so I take quick phone pics weekly from the same angle to catch slow weight loss.

How they behave and who they get along with

Spotted spikefish are generally calm and a bit shy, but they are still a predator with a small mouth built for crustaceans. They spend a lot of time hovering, inspecting, and picking. They spook easily and can inflate if handled, so keep hands-off drama to a minimum.

• Good tankmates: other cool-water, non-bullying fish that will not outcompete them at feeding time.
• Avoid: fast, aggressive feeders (many wrasses, triggers), nippy fish, and anything small enough to be eaten.
• Inverts: most shrimp and small crabs are snacks. Snails can get investigated and sometimes harassed.
• Multiple spikefish: possible, but I would only try in a large, calm setup with lots of hiding and very close observation.

They appreciate a quiet routine. Sudden changes like rearranging rock, blasting the lights on, or chasing them with a net tends to set them back. If you must move one, use a container rather than a net whenever you can.

Breeding tips

Breeding Hollardia meadi in home aquariums is basically unheard of. They are collected from deeper water, and we do not really replicate their natural seasonal cues well. If you keep more than one, you might see some social posturing, but I would not plan a setup around breeding.

Common problems to watch for

Most issues trace back to three things: shipping stress, temperature mismatch, and not eating enough. Catch problems early and you can often turn them around.

• Refusing food: common right after arrival. Offer live foods briefly, then transition to frozen and tong-feeding.
• Skin infections and fin rot: stress related. Keep water very clean, avoid bullying tankmates, and do not let leftovers sit.
• Parasites (internal or external): weight loss despite eating, flashing, heavy breathing. Quarantine is your friend with deepwater fish.
• Swim issues after inflation: usually from rough handling or chasing. Keep the environment calm and avoid nets.
• Tooth overgrowth: not as notorious as some puffers, but it can happen if the diet is too soft for too long. Mix in tougher foods occasionally.

If you want the honest take: this is an expert fish because it punishes "normal reef tank" assumptions. Give it cooler, steadier water, keep the tank calm, and obsess a little about feeding, and it can be a really rewarding oddball to keep.