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The only reason being is because someone told us that the u3 isn’t strong enough for a 160L tank and would need the u4. We have brought the u4 but just seemed a bit much for our guppies when they were swimming

Hi guys. It’s just a query really, we have a 160L tank for our tropical fish & currently have a fluval u3 filter in place. We have 24 small tropical fish in there at the mo. We were thinking of swapping it for a fluval u4 filter, although we’re worried it may be too strong for our guppies. Any...