Hi! am getting a new canister for my planted tank.. sunsun 603b.. What can be the max off time for this canister? I got jungle with lots of fish(over crowded).. I don't want to run the canister all the day..would like to turn it off Night.. is this okay? How about hang on back filter instead of canister filter? I heard people saying not to turnoff the canister more than 2 hrs..Let me know guys so that I would buy any other filter..