The marineland 150 i had for my 30 gal was starting to make a lot of noise from the motor for some reason. I called marineland and told them what was happening and they told me to put the propeller in vinegar for 3 hours and that should fix the problem. Well fearing that my fish would not do well for 3 hours without a filter i went and bought a Aqueon 50 which is rated for up to a 50 gallon tank. So i had the Aqueon 50 running while i had the propeller from the Marineland 150 soaking. After 3 hours i tried the marineland again and it does seemed to have fixed my noise problem. Now i have the both running at the same time. I have 2 bichirs and 2 chinese algae eaters in the tank. Is this okay or should i remove one? I really like the Aqueon and if i had to get rid of one it would be the marinland 150. Im wondering is the tank is being over filtered or causing too much current, all the fish are behaving normally just wondering if this is bad news for the long run?