All my plecs eat the following on a rotation basis--Kind of "Hmm, what did they get yesterday? Okay, then, how about this today"
zucchini
cucumber
Summer squash
shrimp pellets
algea wafers (a wafer per half inch)
brine shrimp (except my Panaques)
blood worms (again, not the Panaques)
Tetra Color bits
Fruit
I also feed daily (and if they are babies, twice or three times a day)