Red Sea 260 Filter

[raulmet]

I currently have a Red Sea 260. I’ve seen a rectangular filter that installs directly into overflow, but I can not find it anywhere on the internet. Can someone please help point me in the right direction to find a filter that fits.

 

[Rocks reef]

I am not sure either. I am doing a search and everything that I see is the middle portion is for the protein skimmer.