I just bought a aquatech 20-40 filter for my 14g tank... I wasn't aware that the filters had carbon in them... is this filter worth using of should I take it back and get something else in the 30 dollar range?
As long as the flows not too rough for your fish the GPH is fine. Smaller tanks are more likely to have a problem the water being too rough than larger ones... but right now I have a total of 250gph... overkill? maybe but it does a good job... plus my hair algae problem is going down... whoda thunk filtration would be the key