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There can be no single "right" number because all tanks are different with different owners doing it all different ways. It sometimes takes a bit of time and watching. Much will depend the fish you might have. If testing shows all the ammonia is being taken care of by the filter, I look to cheaper things like powerheads if I need more current.
That all aside, it does seem you should have plenty in most cases.
That all aside, it does seem you should have plenty in most cases.
