filter material

Ok, I'm a rookie within the saltwater tank community, only having freshwater in the past. I have a Cascade 1000 Canister Filter in a 55 gallon tank and I have a question or two for your enjoyment! 1) I bumped the filter while running the sweeper the other day and noticed a white sediment...

Hi Everyone, I have a spare standard 3ft tank with overflow box and sump and am excited to setup my first marine tank however I'm somewhat confused.....:confused: I'm confused on the following so I'm hoping everyone can help me out...I have read quit a bit in the forum and am still...