I currently have a rena xp3, in a 55 gallon tank that I was cleaning monthly, but recently started to clean every 2 weeks because I noticed the flow of the water slowing down. I just purchased a 155 gallon tank and plan to use that filter in this tank as well, but was wondering if I should get another xp3 or an xp4 to run 2 filters, or just continue with the 1 filter.
Would it be better to run 2 filters, or is the xp3 sufficient?



