Wavyband sole

Where they come from

Wavyband soles (Zebrias japonica) are little flatfish from coastal Japan and nearby areas. Think shallow sandy flats, eelgrass edges, and places where they can vanish into the bottom in a heartbeat. That lifestyle drives basically everything about how you keep them.

Setting up their tank

If you take one thing from this: build the tank for the sand bed, not for the fish. These guys live on (and in) the substrate, and they get stressed fast if they cannot bury and rest the way they want.

• Tank size: I would not do less than 30 gallons for one, and 40+ is just easier to keep stable.
• Substrate: fine sand, deep enough that they can fully disappear (2-3 inches is a good target).
• Flow: moderate overall, but give them calm zones on the bottom so they are not getting blasted while resting.
• Rockwork: keep it secure and leave open sandy areas. They want runway more than caves.
• Intake protection: cover powerhead and overflow intakes. A wandering sole can get pinned against an unguarded intake at night.
• Lighting: they do not need anything special, but bright reef lighting with no shaded areas tends to keep them edgy. Provide dimmer corners or overhangs.

Water quality needs to be steady. They are not a "new tank" fish, and they do a lot better once your sand bed and microfauna have matured a bit. Stable salinity matters more than chasing a magic number.

What to feed them

This is the make-or-break part. Wavyband soles are picky, and many arrive skinny because they have been ignored in holding tanks. You are aiming for meaty foods that sink and sit on the bottom where they hunt.

• Best starters: live blackworms (if you can source them safely), live mysis, enriched live brine (as a training food, not a staple).
• Go-to frozen: mysis shrimp, chopped clam, chopped shrimp, finely chopped squid, quality marine blends.
• Pellets: sometimes, but do not count on it. If they take pellets, great - still rotate in frozen foods.

Feed smaller portions more often at first, especially with a thin new fish. Two small feedings a day beats one big dump. Watch the belly line: you want them to look gently rounded after meals, not pinched.

If you keep other bottom feeders, you may need target feeding with tongs or a turkey baster. They are not fast, and they will lose every race to a wrasse or a hungry shrimp.

How they behave and who they get along with

They are shy, mostly nocturnal/crepuscular in a bright tank, and they spend a lot of time partially buried with just the eyes showing. Once settled, they have a calm, "always on patrol" vibe along the sand.

• Good tankmates: peaceful fish that stay in the water column (small cardinals, firefish with care, gentle gobies that are not territorial about the same patch of sand).
• Risky tankmates: aggressive wrasses, dottybacks, big hawkfish, triggers, larger puffers, and anything that likes to pick at flat things.
• Inverts: cleaner shrimp can be fine, but hungry peppermint-type shrimp may steal food right off the sand. Big crabs are a no.
• Other soles/flatfish: possible in a bigger tank with lots of sand, but expect competition at feeding time. I would start with one unless you have a plan and space.

Breeding tips

Breeding Wavyband soles in home aquariums is not common. Like a lot of marine flatfish, they likely spawn pelagic eggs and have a larval phase that is a whole separate project (live foods, dedicated rearing, and a lot of trial and error).

If you are determined, your best "first goal" is simply getting a healthy, well-fed adult that is comfortable enough to show natural behavior. Stable photoperiod, heavy feeding, and a stress-free sand bed are the foundation. Past that, you are in experimental territory.

Common problems to watch for

• Starvation: the #1 issue. They can look "fine" while slowly wasting away. Track body condition weekly.
• Getting outcompeted: food thieves (wrasses, shrimp, crabs) will keep them alive-but-thin unless you target feed.
• Substrate injuries: rough substrate or dirty sand leads to belly abrasions, red patches, and infections.
• Parasites and bacterial issues after shipping: watch for rapid breathing, flashing, cloudy patches, fin erosion. Quarantine helps a lot if you can provide sand in QT.
• Intake accidents: unguarded powerheads/overflows can trap them, especially at night or during startled darts.
• Stress from too much activity: constant sand-sifting by other fish, high bottom flow, or boisterous tankmates keeps them buried and not feeding well.

If you set up the sand bed right and you get them eating early, they are rewarding in a quiet way. Most of the "advanced" label is really about patience and being stubborn about feeding and bottom safety.