I run my 300gal with 4 fx5's. A bit more of pain to rinse out every few months ( alternating cleaning filters of course ). They work great, hold a lot of media and a lot of flow. And you can swap them out and around if you have other set ups. Way more expensive to do it this way though. This is my juvenile Ray tank. 10" to 13" roughly. I have 4 Rays and others - 3 severums, 2 Bichers , pleco, and a 18" silver aro in there. Never an issue with 40% water changes at least weekly but usually every 5 days. That tank has been running like that for years
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