My closet set up is a 30 gal. storeage tug from wally world{wal-mart} in the resevoir I put a under gravel filter. It's a pump that has two suction cup that hold it in place.It will move your water all around in the res keeping the nutrients mixed and helps put oxgen in the water too.I also use a small air pump and air stone in the tank too.My closet is air condition and I have a 8" fan moveing the air all around the closet. This helps keep the water temp at about 68* to 72* degree in the tank. I hope this helps you .Have a great day!