Darkspotted catfish

Where they come from

Darkspotted catfish (Aspidoras fuscoguttatus) are little South American cory relatives from Brazil. Think small streams and calm backwaters with leaf litter, sand, and a lot of cover. That whole "tea-stained" look you see in photos of Amazon-type habitats - they feel right at home in that kind of setup.

Setting up their tank

These guys are tiny and busy, but they are still catfish that spend most of their time on the bottom. A 10 gallon can work for a small group, but 15-20 gallons is way nicer once you want a proper school and some plants.

• Group size: 6+ (8-12 is even better if your tank allows it)
• Substrate: fine sand is my pick; smooth small gravel can work but sand keeps barbels looking great
• Filtration: gentle flow, sponge prefilter on intakes if you can
• Temp: mid-70s F is a good target (around 74-78F)
• Water: they do fine in neutral-ish water; stability beats chasing numbers

Give them shady spots. Leaf litter, small wood, clumps of plants, and a few little caves make them act way more natural. I also like keeping some open sand up front because you will actually see them foraging.

What to feed them

They are easy to feed once you realize they are not "clean-up crew". They eat like little pigs if you offer food that sinks and is the right size.

• Staples: small sinking pellets, micro wafers, crushed cory tablets
• Frozen: baby brine shrimp, daphnia, cyclops, chopped bloodworms (not every day)
• Live if you have it: grindal worms, microworms, baby brine shrimp
• Extras: Repashy-style gel foods work really well for a group

I feed small amounts twice a day more often than one big dump. They forage constantly, so smaller meals keep them in that "searching" mode instead of doing one mad dash and disappearing.

How they behave and who they get along with

Aspidoras are like Corydoras in personality, just smaller and a bit more dart-y. In a good-sized group they stay out and do their little synchronized bottom patrols. In too small a group they get skittish and you mostly see tails.

They are peaceful and do best with other calm fish that will not constantly outcompete them at feeding time.

• Great tankmates: small tetras, rasboras, pencilfish, small peaceful gouramis, otos, shrimp (adult shrimp are usually fine)
• Use caution: boisterous barbs, bigger rainbowfish, larger cichlids, anything that slams food the second it hits the water
• Bottom buddies: they can share space with other small catfish, but watch crowding and make sure everyone gets fed

Breeding tips

They will breed in home tanks, especially once they are settled and you are consistent with water changes and good food. If you have ever bred corys, the vibe is similar: a cool-ish water change plus heavy feeding often flips the switch.

• Start with a well-fed group (more females than males helps if you can manage it)
• Condition with frozen/live foods for a week or two
• Trigger: a larger water change with slightly cooler water, plus a good flow of fresh water
• Spawning spots: glass, plant leaves, filter pipes, and fine-leaved plants/mops

Eggs can get eaten, so if you want to raise fry, move the eggs or move the adults. I have the best luck rolling the eggs off the glass with a fingertip and putting them in a small container with an airstone and a tiny bit of antifungal help (or just very clean water and daily changes).

Common problems to watch for

Most issues I have seen with Aspidoras come from three things: dirty substrate, not enough food making it to the bottom, or stress from being kept in too small a group.

• Barbel wear or mouth irritation: usually rough substrate or muck building up in the bottom
• Skinny fish: they are getting outcompeted - switch to smaller sinking foods and feed more strategically
• Hiding all the time: group too small, too bright/open, or tankmates too pushy
• Rapid breathing/surface gulping nonstop: check ammonia/nitrite, nitrate, temperature, and surface agitation

One more practical thing: go easy with meds that contain copper, especially if you also keep shrimp or snails. If you ever need to treat something, I quarantine when I can and stick to fish-safe meds with known dosing rather than guessing in the display.