i feed my polys a mix of pellets and bloodworms and such if they r young... as they get a lil larger I cut up pieces of fish for them to munch and they enjoy the occasional algae wafer... my big polys mainly get fish filet... and when im not being lazy I dig up nightcrawlers in non winter periods and they love those...
im glad the pvc is gettin covered in algae now... then they blend in with the back of the tank...
but in order to get that effect I am having to clean my glas alot :S damn algae