Lancer red banner blenny

Where they come from

Emblemariopsis lancea is one of those tiny Caribbean reef blennies that lives life wedged into holes. Think shallow reef rock, rubble, and little crevices where a fish can poke its head out, grab a passing bite of food, and duck back in before anything bigger notices.

They are easy to miss in the wild because they do not cruise around like a wrasse. They are more like a little periscope with fins. That tells you almost everything about how you need to keep them.

Setting up their tank

If you try to keep this fish like a typical "nano reef fish" that swims in open water, you will get a stressed blenny that hides nonstop and slowly wastes away. The whole game is giving it a home base: a tight hole it can claim, with food drifting past often.

• Tank size: bigger is fine, but layout matters more than gallons. Even in a larger reef, build a quiet rock zone where it will not be outcompeted.
• Rockwork: lots of small holes and short tunnels. Rubble piles, branching rock, and stacked pieces work great.
• Bonus shelters: a small chunk of live rock with natural micro-holes, or a little cluster of empty barnacle shells or small diameter PVC tucked out of sight.
• Flow: moderate, not blasting. You want food to pass by its perch, but you do not want it fighting a constant jet while it is trying to pick at prey.
• Lighting: anything reef-normal is fine. They do not care about PAR, they care about feeling secure.

Stability matters a lot with this species, but not in the dramatic way people talk about online. They are just small and do not have much "buffer" for swings. Keep salinity steady, keep the tank mature enough to have micro-life, and do not add them to a brand-new sterile box.

What to feed them

This is where most people lose them. They are not algae grazers like a lawnmower blenny, and they are not bold pigs at feeding time either. They are micro-predators that want lots of small meaty bites, offered in a way they can actually get.

• Best staples: live copepods, live baby brine (as a starter food), enriched frozen cyclops, calanus, rotifers, finely chopped mysis, and other small plankton foods.
• Prepared foods: some will take tiny pellets or flakes eventually, but I would not buy one assuming it will convert.
• Feeding style: target feed near its hole with a pipette or turkey baster so it does not have to fight tangs and wrasses in the water column.
• Frequency: small amounts multiple times a day beats one big dump. Think "reef plankton drifts by all day" rather than "dinner time."

How they behave and who they get along with

Personality-wise, they are brave from the safety of a hole and pretty timid in the open. You will see them post up, watch the room, and do quick darting grabs for food. They are fun fish, just not in a constant-motion way.

They can be territorial about their exact crevice. In a big reef with lots of hidey spots that usually just looks like some posturing and short dashes. In a cramped rockscape, it can turn into nonstop stress.

• Good tankmates: calm gobies, small basslets, firefish (with plenty of cover), small cardinalfish, and generally peaceful reef fish that do not bulldoze the rockwork.
• Tankmates to avoid: aggressive dottybacks, pushy wrasses, bigger hawkfish, larger shrimp that like to yank fish around, and anything that will camp the same holes.
• Other blennies: risky. Similar niche blennies often means hole wars, especially in smaller systems.

Breeding tips

They are cave/crevice spawners like a lot of blennies, with eggs laid in a protected spot and the male typically guarding. In a display reef, you might see courtship behavior, but raising the babies is the hard part.

If you actually want to try, treat it more like breeding tiny marine ornamentals than "my clownfish spawned." You will need a dedicated setup and a plan for first foods.

• Provide spawning sites: tight tubes, barnacle clusters, or small cavities they can fully claim.
• Feed heavy on small meaty foods to condition them.
• Expect tiny larvae: you will be in rotifer and phytoplankton territory right away, with copepod nauplii as a big help.
• Gentle larval rearing: low flow, stable salinity, and careful lighting. The usual "greenwater" approach can help keep food in front of them.

Common problems to watch for

• Slow starvation: the number one issue. They get outcompeted easily, or they only take a few bites per feeding and slowly fade.
• Hiding forever: usually means it never found a secure hole, it is being harassed, or flow is blasting its perch.
• Jumping: especially after being chased or during sudden lighting changes.
• Shipping stress and refusal to eat: they are small and can arrive already depleted.
• Typical marine parasites: ich/velvet can still happen, and small fish go downhill fast. Have a quarantine plan before you buy one.