I am about to buy a 10 gallon tank. Would it be better if I bought a power filter and an internal filter (possibly PENGUIN MINI WITH BIO-WHEEL - Certified Flow: 100GPH and FLUVAL 1 "PLUS" UNDERWATER FILTER: 50 GPH) or just one filter, such as HOT MAGNUM PRO SYSTEM - H.O.T. MAGNUM PRO SYSTEM or EMPEROR 280 WITH BIO-WHEEL?