fluval 206

I’ve just cleaned the fluval 206 my secondhand tank came with. This is what was inside, do I need to add anything?. Also what is the very thin white foam in one of the baskets so I can replace it?. I don’t know how the original filters are set up or what they should be set up like for SW.

Hi Friends, My name is Dylan and I had been in the marine aquarium hobby for about 15 years before selling my tank in 2016. My previous setup was 65 gal, mostly fish only, with a few inverts and soft corals. (Anemone, mushrooms, zoa's, etc.) I recently bought a used 15 Gal column (Aqueon) to...

Has anyone made any mods to the fluval? I am thinking about removing the E side and filling it with live rock only. Any feedback?