So, I want to add co2 to my tank. I want to invest in a powerhead because i know thats one of the best ways to diffuse co2. also, the ceramic diffusers are also very interesting, it takes out the powerhead but it has it's own concenquences i.e. not having build enough pressure to actually diffuse. also i've heard that ceramic tiles don't really diffuse that much co2 as it floats to the top anyway. but the powerhead concept has it's own drawbacks as well. i read in a thread by welchrock about how a powerhead has turned his fishes ill. i don't think that a small powerhead that will pump in water will hinder fishes that much will it?