I have a 75 Gallon Community Tank with a Fluval FX4 Canister. I have the Output Nozzle facing up on one side to keep a nice ripple stream moving across the top. I also have a Topfin Air 4000 running in the middle back with a circular airstone. It was always my understanding that the more air the better but I seen a conversation (that I can't find now, I was reading on my phone at the time) that someone was saying you can have to many bubbles and circulation in the tank. I would greatly appreciate any input here. I can take out the airstone if its to much. I have a mixture of Live Plants with some Fake ones if that makes a difference.