I have a 20 gallon long with cory catfish, zebra danios, and guppies. My honey gouramis will be done with quarantine Friday and they are going to the 20 gallon as well. I am worried now that the surface will be too strong and will stress them out. I know I cannot make my bubbler less powerful as there is so many fish in there that need it. I've turned down my filters a bit as I have two 20 gallon ones, and I'm not worried about them being a bit less strong. Thanks!