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When my tank is finished cycling, I am going to get 3 young fancy goldfish, no more than 3" long including tails. And I want to add aeration, since the filters don't make the surface as ripply as I feel comfortable with. But, I don't want the current to be too strong for little fish. What is a good bubble-producing thing to aerate the tank? And where should any be placed? I like bubble walls, but that may be too much current. I'm not going to have a substrate, but don't airstones need to be weighted down with gravel? I don't have any experience with aeration devices, if that's not clear already. Advice would be appreciated. Thanks in advance.