When I first started my tank, I bought an Aquean Quiet Flow 20 and the water never seemed to be very clear. I bought an Aquaclear 50 last night (the tank is 20G) and all I have to say is WOW. I installed it last night and this morning, my water is crystal clear. I still have the AQF 20 running - I should keep both running for about a month, correct?