only thing ive seen mine eat is jmc catfish pellets, must be eating something as i ran out of these months ago and didnt buy any-more due to the oily mess they make... which snails are safe to feed, are mts any good?
IDK. You'd need to dig a bit to be confident w.r.t. the species. In general, we know that, e.g., Oxydoras niger has a nickname "Mother of all snails" because people have been finding any and all kinds of snails in their stomachs. I'd imagine Megalodoras should not be too different.