I had my tank setup with no problems up until a year ago when i had to move so i basically drained the tank and threw everything out. I have the eheim 2217 canister which i actually disconnected and left it filled for a year with the water that was in it after i disconnected.yesterday i filled up my tank with tap water and i set up the canister and I plugged it in and was wondering should i have prepared the canister all over with new material. would it be ok if i just left it since the bacteria will get cleaned by the filter? should i disconnect the tank and change something? should i drain the tank again? should i just runit as a freshwater tank at this point? i'm not really sure what to do .can someone please help me?