I've never liked goldfish myself because of the waste, but that's what she wants. I guess if you do a water change like suggested they may not be so bad. We were wanting to get about five fish for our 44 gal. tank. We can add an undergravel filter, but how are those cannister filters that sit under the tank cabinet? Someone was telling me they are very good.

Are there any goldfish that don't mix well in a tank? We wanted to have at least one black moor.