Blackspot razorfish

Where they come from

Blackspot razorfish (Iniistius dea) are Indo-Pacific wrasses that hang around sandy slopes and rubble near reefs. In the wild they spend a lot of time hovering just above the bottom, then vanish into the sand if something spooks them. That burying instinct drives a lot of how you need to set them up in a tank.

Setting up their tank

If you try to keep this fish like a normal rock-and-corals reef wrasse, you are going to have a rough time. They want open sand, room to cruise, and a place to disappear. Think "sand flat with some rock structure" rather than a wall of rock.

• Tank size: I would not do one in anything under 120 gallons. Bigger is calmer, and calmer is everything with this fish.
• Sand bed: fine to medium sand, 2-4 inches. Too coarse and they can scrape themselves up when they dive.
• Rockwork: stable, not a loose pile. Leave a wide sandy runway in front for swimming and burying.
• Flow: moderate. They do not love getting blasted while trying to settle into the sand.
• Cover: tight lid or mesh. They can and will launch when startled, especially early on.
• Lighting: not picky, but give them shaded zones so they can decompress.

Acclimation matters more than people expect. Give them time. A newly imported razorfish may spend long stretches buried and only come out to grab food. That is normal. What you do not want is nonstop glass surfing or panic darting - that usually means too bright, too busy, too small, or too aggressive tankmates.

What to feed them

These are meaty-food wrasses. Most losses I see are fish that never really start eating, or fish that "eat" but stay pinched and fade because the diet is too light. You want frequent, nutrient-dense feedings, especially the first month.

• Great starters: enriched frozen mysis, chopped krill, Calanus, finely chopped shrimp, clam, and squid
• Live help for picky new fish: live blackworms (rinsed well), live brine enriched, small live ghost shrimp if you need a jump-start
• Prepared foods: high quality marine pellets can work once they are settled, but do not rely on pellets at first
• Feeding rhythm: small amounts 2-4 times a day beats one big dump

Soak frozen foods in a vitamin/HUFA supplement sometimes. Not every meal, but a few times a week. It helps a lot with new imports that came in thin.

How they behave and who they get along with

Iniistius are wrasses, but they do not act like the busy, always-in-your-face fairy wrasses. Mine spent plenty of time hovering and watching, then doing quick darts to grab food. They spook easily and they hate being crowded.

• Temperament: usually not a bully, but can throw their weight around with other sand-wrasses or similar-shaped fish
• Best tankmates: calm community fish that do not compete like maniacs at feeding time (tangs with manners, rabbitfish, some angels, larger peaceful wrasses)
• Avoid: super aggressive fish (triggers, nasty dottybacks), hyper food hogs, and other burying wrasses unless the tank is very large
• Inverts: they are predators. Small shrimp and tiny crabs are at risk. Snails and larger hermits are usually ignored, but nothing is guaranteed.

They also do the classic wrasse sleep routine: bury at night (and sometimes during the day if startled). If you do maintenance, go slow. Sudden net waving can make them torpedo into the sand and bounce off rocks.

Breeding tips

Breeding this species in home aquariums is basically not a thing. Like many wrasses, they are broadcast spawners and some are sex-changing. You might see flashing or a quick upward dash at dusk, but getting viable eggs and raising larvae is a whole different level of setup and live food production.

Common problems to watch for

Most problems with blackspot razorfish come down to stress, sand, and shipping damage. They are not forgiving fish, which is why I call them expert-only.

• Not eating after purchase: often stress or too much competition. Dim the lights, offer live or very smelly foods (clam), and feed in low-traffic areas.
• Jumping: usually early on or after a scare. Lid the tank and keep the room calm during acclimation week.
• Sand abrasions and infections: rough substrate or panic-diving into rock edges. Treat wounds early and fix the layout so it cannot repeat.
• Ich/velvet: wrasses can get hit hard. Quarantine is your friend, but remember they need sand even in QT (a container of fine sand works).
• Internal worms: common in wild fish. If you see stringy white poop, weight loss despite eating, or a pinched belly, you may be dealing with parasites.

One last thing from personal experience: give them a few "quiet weeks" after they go in. Avoid big rescapes, chasing algae clips around the tank, or adding aggressive new fish right away. Once they decide your tank is safe, they become way more durable. Getting to that point is the tricky part.