i was thinking about turning this 125 fw i just bought to a ray tank but i also may use it as a place for my sw predators untill i get my own place to set up something bigger for them currently its got two canister and a wetdry filter..my question is can i use theses canisters for sw or do i have to buy certain filters...and also if i can use them would i have to change out all the filter media and replace them? also would i have to clean out the filters good getting rid of any residue in there? heres the pictures of the filteration i no i can use the wet dry just wondering about the canisters i currently do not have the tank i am picking it up this weekend but he told me he used it for african cichlids