In article , "Eric Schreiber" eric
at ericschreiber dot com says...
Go with sinking algae tablets to be safe. You can break them up and
just drop a quarter or half tablet in each day. Drop it in about the
same spot and they should learn where to look for dinner.

I've got two in a 10 gallon tank. The algae tablets are great. I buy
the kind where algae is the top ingredient, a lot have soy meal or the
like with a little algae.

I break a tablet in half and put the halves in different parts of the
tank, otherwise the 2 fight over the food. One tablet twice a week and
I remove the leftovers after 12-24 hours.

Ever see an oto look like an old man snoozing with his pants unbuckled
after a big meal? It's the only time they're not moving :-).

--
Homo sapiens is a goal, not a description