I left town for a couple days and turned off my air conditioning in my apartment to save a little energy, well it got really really warm in excess of 100 degrees in there as I am on the top floor. And as you may have guessed I have some green on a few rocks, the question I have is that I have a pleco that will clean it I am sure but he is a tiny guy right now and I am not sure how long he will take to clean it up, I have heard of the anti algae treatments but wouldn't that kill the little plecos entire food source? If I do this will algae wafers suffice suffice to feed him until the anti algae chemicals dissapate? And how long will it take them to do so?