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okay so i have a cascade 700 if i want a rena xp3
like everyone else has lol
should i keep the cascade filtering too?
so i have two filters or
just sell it or use it on my 10 lol

I don't think there's such a thing of too much filtering. If I where you I would use it with the xp3 or the gallon if it needs it.

the 10 gallon is a community tank and has a whisper 10-15 but i think the cascade would suck all the fish in it haha