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No they dont... but remember I use the water from my 300 frag system to do my water changes... Right now im only doing the water changes to keep the water clean and also establish all the beneficial stuff from my system into this small tank... I wanna stay away from carbon and gfo... just more maintenance to worry about... I am by no means experienced with these small tanks... Im learning as I go basically... im gonna do 2 gallon water changes as I have been for a month and then go to 1 gallon...Is it safe to change 40% that regularly? I was doing 3/4 of 1 gallon and that keeps my parameters in check so far... also I guess this is a good place to ask, do corals add much to the bioload?