Can a Farlowella Catfish eat lettuce?

He naturally eats left over food from your other fish and algae from plants. Algae wafers should not be his only diet. They have little nutrition the live algae your plants have are good enough and better than the stupid algae wafers you buy.

Lettuce is not as great as you think. You might want to feed him some nice food he will enjoy. My goldfishes never even eat lettuce. I don't think any fish eat lettuce only... maybe... snails. My mystery snail eats better food actually like broccoli since it is high in calcium. Bottom line most fish will not even touch lettuce. Try spinach.

I would feed him

Frozen Blood worms

Brine Shrimp

Spinach

Broccoli

Hikari sinking wafers (not just the algae wafers)

You can make your own gel food for your dude.

You will need

2 packets of unflavored jelly

1 Salmon piece

1 catfish piece

1 red bell peeper

1 or 2 slices of cucumber

3 spoonfuls of punkin (it can be from a can just make sure it has no additives)

8-10 de-shelled pees

Add and take what you want and don't want it is up to you what you want to feed your fish.

Cook the salmon and catfish (you can use shrimp) in boiling water do not add anything else yet. Take most of the water out and in the rest of the water softly cook the veggies. Put everything into the mixer and mix until you have everything mixed. I should look like pudding consistency. Then add the unflavored jelly and put the liquid food into the freezer. There you can feed chunks or small pieces to your fish.

You do what you want with the recipe. Your fish is an omnivore so gel food is great for these dudes. I feed this stuff to all my fish and they love it. Try it. You know exactly what is in their food because you are making it.