I just had a bad week on my 55 gallon tank which had visible ammonia 0 nitrites but a whopping 40ppm nitrates. This were the results one week after a canister filter got cleaned fully. I am currently running two canister filters both of which are rated higher than my tank. With the above mentioned issue I would like to install the supplied under gravel filter that came with my tank.(it is a planted tank now.) My issues isn't whether or not to use the filter it is actually about whether or not to use landscape fabric. Would it reduce the filters flow too much? I'd like to have both the plants and the reverse undergravel filter because the added filtration of both would be best. Thanks and I'd love to hear any ideas anyone may have.