i'm considering installing a automatic water changer in my large aquarium.. i have a 11/2" drain cleanout in the wall under my tank and have been wanting to do a drip system for constantly refreshing the water in my ray tank..i would pipe the inlet into the top of the tank and install a 1" bulkhead in the wet/dry at water level (under the tank)to drain out through a 11/2" ptrap and check valve.. my concern is the water i'm putting into the tank is unfiltered tap water.. should i run the tap water through some sort of filtration like a reverse osmosis or just a carbon filter or what.. anyone with experience or knowledge please let me know.the water will run through a small water heater first to bring it to about 84 degrees or so..anyone??