OK I HAVE A 38 gallon long tank with 30 lbs live rock and 20 lbs live sand and a acua clear 70 power head and a heater thats all i have running. im setting my tank up for fish only so what type of filtration do i use and what type of skimmer do i buy. I CANT USE ANYTHING UNDER THE TANK SO ONLY THINGS I CAN USE ON TOP WHAT WOULD BE BEST AND THAT RUNS NO RISK OF OVER FLOWING ON THE FLOOR i used a wet dry and flooded my floor so i dont want anything that can over flow on the floor. WHAT SHOULD I BUY FOR MY TANK SO IT CAN RUN GOOD AND BE EASY TO CLEAN TOO. THANKS FOR HELP MICHAEL