Citrine goby

Where they come from

Citrine gobies (Bollmannia litura) are tiny, bottom-hugging marine gobies from the Western Atlantic/Caribbean region. Think sandy patches and rubble zones near reefs, where they can scoot between little bits of shell and rock and disappear the second something big cruises by.

In a tank they act the same way: low to the ground, quick little dashes, and a lot of time spent perched and watching.

Setting up their tank

This is one of those fish that looks easy because its small, but it asks a lot from the tank. The biggest thing is giving it a mature, stable system with real micro-life and plenty of hiding spots down low.

• Tank size: I would not do them in anything smaller than a well-established 20-30 gallons, and bigger is always easier for stability.
• Tank maturity: 6+ months old is my comfort zone. New tanks tend to be too "clean" and swingy.
• Substrate: fine sand helps. They like to sit on it and scoot around. Crushed coral can be a little rough for a fish that lives on its belly.
• Rockwork: lots of small caves and tight crevices near the bottom. Rubble piles are perfect.
• Flow: moderate. You want oxygen and clean water, but not a sandstorm.
• Lighting: whatever your reef runs. They do not care as long as they have shade and cover.

What to feed them

Feeding is why these are labeled advanced. A lot of citrine gobies arrive skinny, and some never fully accept prepared foods. If you can get them eating, they are tough little fish. If you cannot, they fade fast.

I have had the best luck starting with live and frozen foods that move or drift like plankton, then slowly mixing in other items once they recognize the feeding routine.

• Best starters: live baby brine, live copepods, live blackworms (if you can source safely), and small enriched live foods.
• Frozen staples (once taking food): mysis (small pieces), cyclops, calanus, finely chopped krill, and quality frozen "reef plankton" blends.
• Prepared foods: some individuals will take tiny pellets or flakes, but do not count on it at first.
• How often: small meals 2-3 times per day beats one big dump. They are tiny and not built to go long between bites.
• Target feeding: a turkey baster or pipette is your friend. Deliver food right to the bottom near their perch so it does not all get stolen midwater.

How they behave and who they get along with

Citrine gobies are peaceful, shy, and kind of hilarious once they settle in. They perch, scoot, and do quick little "teleports" from rock to rock. They are not a showy swimmer, so do not expect them to compete in the open water.

The main issue is not them being aggressive. It is everyone else outcompeting or stressing them.

• Good tankmates: small, calm fish that are not food-obsessed bullies. Think small cardinals, firefish (in mellow setups), tiny blennies, and other gentle reef fish.
• Be careful with: fast, aggressive feeders (many wrasses, dottybacks, damsels), and anything that patrols the sand hard.
• Avoid: predatory fish and big shrimp that might treat a tiny goby like a snack.
• With other gobies: depends on space and personality. In a small tank, two bottom gobies often end up in a staring contest over the same corner.
• Corals/inverts: reef-safe. They may perch on low corals, but they are not coral nippers.

Breeding tips

Breeding in home aquariums is possible in the "gobies do goby things" sense (pairs spawning in caves), but raising the larvae is the hard part. Like a lot of small marine gobies, they are likely to produce tiny pelagic larvae that need live planktonic foods and a dedicated larval setup.

• If you want to try: keep a bonded pair (not just two fish tossed together), provide multiple tight caves, and keep them well-fed on varied meaty foods.
• Spawning signs: the pair hangs around one cave, the belly of the female looks fuller, and the male may guard/hover at the entrance more.
• Larval reality check: you will need rotifers, live phytoplankton, careful light control, and a rearing tank. In a reef display, larvae usually become coral food.

Common problems to watch for

Most issues with citrine gobies come down to stress + not eating. If you keep them calm and get calories into them early, you are way ahead.

• Starvation/weight loss: the #1 problem. Look for a pinched belly or a "knife edge" back. Act fast with live foods and target feeding.
• Getting bullied off the bottom: even "peaceful" fish can harass them just by constantly cruising their space.
• Parasites on arrival: marine ich/velvet can hit any new fish, and small gobies go downhill quickly. Quarantine is worth it if you can do it without starving them.
• Jumping: especially new additions. A lid saves lives.
• Sand irritation: coarse substrate and constant blasting flow can keep them stressed and scraped up.
• Hiding forever: usually a sign they feel exposed or are being outcompeted. Add more low cover and feed right to their bolt-holes for a week.