It is unlikely that the other fish are going to eat the whole thing. There is probably enough left over for the pleco. I have two plecos in my 50 gal
along with a ton of other fish. I know food hits the bottom of the tank, even though it looks like the others get everything. I also throw in a broken algae wafer and everyone eats on it, but if I look closely, there is still some left at lights out.
That's another thing, if you are concerned the pleco isn't getting his share, drop the wafer in after turning the tank light off. Plecos are noturnal and will eat while the others are sleeping.
, what type of pleco did you get?