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· Aquatic Philosopher
15,750 Posts
You can do without if you have waterflow from another source like a prop pump (koralia) or strong enough powerheads. For as long as you have enough biological activity in your live rock, it should be fine. The 55 filter is normally a bit tedious with proper maintenance for most systems, although if you have a FOWLR setup, it might be fine to leave it on there.
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