Yaluwak armored catfish

Where they come from

Fish sold as "armored catfish" almost always trace back to South America. A lot come out of blackwater or clearwater tributaries where the water is warm, soft, and moving, and the bottom is sand, leaf litter, and wood.

If your fish arrived skinny but with a big head, and it spends its time stuck to wood or glass, you're probably in pleco territory. If it scoots around the bottom in bursts and rests a lot, more Cory territory. That difference matters for food and flow.

Setting up their tank

For an expert-level armored catfish, your tank setup is make-or-break. They can live through a lot, but they won't do well if the bottom is rough, the oxygen is low, or the water is old.

• Tank size: I would start at 40+ gallons for a single larger pleco-type, or 20 long+ for a small Cory-sized fish in a group. Bigger is always easier because waste adds up fast.
• Filtration: strong bio filtration plus real mechanical filtration. These fish are poop machines.
• Flow and oxygen: give them current and surface agitation. I run an extra sponge filter or a powerhead aimed along the bottom.
• Substrate: sand if there's any chance it's a bottom-sifter (Cory-type) or a species that rests on its belly. Sharp gravel will wreck barbels and bellies.
• Hardscape: driftwood is not decoration for many armored catfish, it is part of the diet and a comfort blanket. Add caves too - tight ones, not big open arches.
• Lights: keep it on the dimmer side and add cover (plants, wood). They are bolder when they feel hidden.
• Water: aim for stable, clean freshwater. If you do not know the species, stay moderate: 74-78F, pH around neutral, and do frequent water changes rather than chasing numbers.

What to feed them

Most people underfeed the right foods and overfeed the wrong ones. "Algae eater" on a label does not mean it lives off your glass. In my tanks, the ones that stayed thick, active, and colored up were the ones that got a mixed menu and a routine.

• Staples: quality sinking wafers/pellets made for catfish, rotated between veggie-forward and protein-forward types.
• Veggies: zucchini, cucumber, green beans, and blanched spinach. Clip them down so they do not float away. Pull leftovers after 12-24 hours.
• Protein (sparingly at first): frozen bloodworms, mysis, brine shrimp, and small sinking carnivore pellets. Start light and watch the belly.
• Wood: if it is a pleco-type that rasps, driftwood helps digestion. I noticed less bloat and better poop when there was always wood to work on.
• Feeding schedule: feed after lights out. These fish relax and actually eat when the tank is calm.

How they behave and who they get along with

Armored catfish are usually peaceful with anything that does not hassle them, but they can be surprisingly territorial with their own kind, especially around caves. The bigger the fish and the smaller the tank, the more drama you get.

• Good tankmates: calm community fish that ignore the bottom (tetras, rasboras, many rainbowfish), and peaceful cichlids if the tank is big and there are lots of hides.
• Risky tankmates: fin-nippers (they stress catfish into hiding all day), aggressive cichlids that claim the whole bottom, and anything that competes hard for caves.
• With other armored catfish: if it is a pleco-type, add multiple caves and break lines of sight. If it is a Cory-type, keep a proper group so they feel secure.

Breeding tips

Breeding depends completely on what this fish actually is. Most pleco-type armored catfish are cave spawners where the male guards eggs, and most Cory-type fish scatter eggs and you pull the adults or the eggs.

If you want a realistic shot without knowing the exact species, focus on conditioning and season cues. Big water changes with slightly cooler water, heavy feeding for a couple weeks, and lots of oxygen often trigger spawning behavior in the right fish.

• If it is pleco-type: provide snug caves (different sizes), feed heavy but keep the water very clean, and watch for one fish camping a cave and fanning.
• If it is Cory-type: keep a group, give them smooth plants or spawning mops, and be ready to move eggs because adults will snack on them.
• Either way: fry usually need tiny food early (baby brine, powdered fry foods) and spotless water.

Common problems to watch for

Most issues I see with armored catfish are not random disease. They are wear-and-tear from the wrong bottom, not enough oxygen, or slow starvation because the fish only eats what it can find in the tank.

• Sunken belly or "pinched" look behind the head: underfeeding or the wrong food mix, sometimes internal parasites. Fix diet first, then consider meds if it still wastes away.
• Red or worn barbels/belly: rough substrate, dirty bottom, or bacterial irritation. Switch to sand, increase maintenance, and reduce sharp decor.
• Bloat and floating: often from too much rich food too fast or poor gut function. Back off protein, add veg and wood, and improve oxygenation.
• White scrapes on the body: these fish wedge into hardscape. Smooth sharp edges and give them a cave that fits so they stop forcing themselves into bad spots.
• Rapid breathing or constant air-gulping: low oxygen, high waste, or heat with not enough surface agitation. Add flow, lower temp a touch if safe, and clean the filter.