Velvety sole

Where they come from

Velvety soles (Brachirus villosus) are one of those fish you almost never see unless you go looking for oddballs. They come from slow, silty freshwater areas in parts of Southeast Asia, where the bottom is soft and the water is often tannin-stained. Think muddy flats, leaf litter, and a lot of hiding in plain sight.

That background explains basically everything about them in aquariums: they want a calm tank, a soft bottom, and food that comes to them on the substrate.

Setting up their tank

If you try to keep this fish like a typical community bottom-dweller, you will get a stressed, skinny sole that never really settles. Build the tank around the bottom and the rest gets easy.

• Tank size: I would not do smaller than a 40 breeder footprint, and bigger is better. They use floor space, not height.
• Substrate: fine sand. Not gravel. They bury and shimmy, and gravel can scrape them up.
• Flow: low to moderate. They do fine with good filtration, just dont blast the bottom.
• Decor: leaf litter, driftwood, smooth stones, and shaded areas. Give them places to vanish.
• Lighting: subdued helps a lot. Floating plants or tannins make them bolder.
• Water: clean and stable beats chasing numbers. Avoid sudden swings, especially after big water changes.

Filtration-wise, I like a canister or a big sponge setup that keeps the water clean without creating a sandstorm. They are messy eaters because you are feeding meaty foods that break apart, so plan on vacuuming the surface of the sand (lightly) and doing steady water changes.

What to feed them

This is where most people lose them. Velvety soles are not grazers and they do not compete well at feeding time. If you drop flakes in the current and hope for the best, the sole will slowly fade away while everyone else gets fat.

• Best staples: sinking meaty foods like chopped earthworms, blackworms, bloodworms, mysis, and quality sinking carnivore pellets (once they accept them).
• Great training food: live or frozen blackworms. They trigger a strong feeding response.
• Occasional treats: small pieces of shrimp or fish fillet (not oily), chopped mussel, live river shrimp if you have them.
• Feeding style: target feed to the bottom after lights dim, or use feeding tongs/pipette to place food right in front of them.

Watch the body shape. You want a nicely filled-out fish, not a paper-thin outline. If it is always flat and pinched behind the head, it is not getting enough, even if you see it eat occasionally.

How they behave and who they get along with

They are calm, sneaky ambush feeders. Most of the day they sit half-buried or laid out like a wet leaf. At night, they get more active and will cruise the bottom in short bursts.

The big compatibility rule is simple: if it fits in the sole's mouth, it is food. They are not aggressive in the usual sense, but small fish and shrimp can disappear.

• Good tankmates: peaceful midwater fish that wont harass the bottom (larger rasboras, peaceful barbs, rainbowfish depending on size, calm gouramis).
• Avoid: fin-nippers, boisterous cichlids, hyper feeders that vacuum the bottom, and anything tiny (nano fish, dwarf shrimp).
• Bottom mates: I usually avoid other bottom predators. If you do, keep it spacious with multiple feeding spots.

Breeding tips

Breeding Brachirus villosus in home aquariums is rare. Most specimens in the hobby are wild-caught, and their spawning behavior is not something most of us accidentally stumble into in a community tank.

If you want to take a swing at it, your best bet is a species tank with a group (so you have both sexes), heavy feeding, and seasonal cues like slightly cooler water for a few weeks followed by warmer water and large water changes. Even then, dont be surprised if you never see eggs - they can spawn discreetly and the adults will happily eat anything they find.

Common problems to watch for

• Starvation: the number one issue. They eat, but not enough, especially in busy tanks. Track body condition weekly.
• Skin abrasions: caused by gravel, rough decor, or rough netting. Use a container to move them instead of a net if you can.
• Bacterial infections after scrapes: look for red patches, cloudy areas, or fuzzy edges on the fins. Act fast.
• Internal parasites: wild-caught fish sometimes come in thin with stringy poop. Quarantine and consider deworming if you know what you are doing.
• Poor water quality from meaty foods: leftover worms and shrimp foul water quickly. Feed smaller portions, siphon leftovers, and keep up with water changes.

My best advice with this species is simple: give it sand, give it shade, and feed it like a sneaky predator that would rather eat in peace. If you can do that, you will get to see a really cool fish that most people never keep successfully.