What do these guys eat? I've kept one for over a year with my common plec and some silver sharks in my 100gal (130US gal) aquarium. I put courgette in the tank, lettuce etc for the plec and algae wafers. Whilst it has never died, it is always looking thin and has hardly grown, if at all. What can I do? I have pinned food down at the bottom of the tank - as it hides with the plec during the day and I assume must eat at night as my plec does. Since it is still alive I have to assume it is eating - after a year it would be dead. Any tips?