so i have 2 oscars (bout 8") in my tank with two plecos. one is about 13" and one is only about 5". so i feed the pleco's algae wafers, or at least try to. i'll feed the o's some pellets to distract, then drop in a few wafers. but sure enough the **** oscars go and eat those of the bottom too. they are greedy fish. are there like super large wafers that the o's couldn't eat? or do i have to go for the zuchinni (sp?) tied to a rock? if so do i just use fresh from meijer? do you tie it to a rock so that it is like a bouy (sp?) or do you tie it tightly to the rock and they just munch on it from there? fishing line good for rope? let me know asap. my plecos are hungry!