there is no such thing as over filtration, the only problem with this high filtration is the whirlpool effect which pumps water so fast that the fish are constantly whirled around in a whirlpool. If you are going to have a high water pump get river fish that like a high current. IMO go for the filter, it will do you good
A HOT250 may have too much output. I do agree that more filtration is better, I would also like to say that the fish may have trouble swimming about with such current. Gobies would undoubtedly enjoy a swift flow. I don't know that a gourami could hold his bubble nest together,though.
danios love a fast current, as well as most catfish (with few exceptions). If your type of fish comes from a river generally it likes fast current, if it comes from a lake it will like a slower current
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