From everything I read, bio wheels are great for a tank. Most of the bio wheels I have seen are a part of the hang on back filter. I have also seen some that are an attachment for HOB and canister filters. They are supposed to help provide excellent biological filtration, and if yours is the separate kind, it would be easy to "borrow" it to start seeding a new tank in the future. The only complaint I've read is when they clog. That should be no problem though.