We purchased some Pothos from Home Depot, rinsed the roots really well and they have been in the little plastic holders (roots only) in our aquarium for about 2 months. The plants are growing great; however, the roots appear to be rotting? They used to be white and now they are black and pie6 ces keep falling off. Yesterday, out of no where, our water turned cloudy. Ammonia and Nitrites are 0 ppm, nitrates = 20 ppm. 50% WC every two days. We have 2 Fluval 407's running and and airstone. Our tank is 55g and we have 6 discus, 6 Harlequin Rasbora's. 5 cardinal tetras, two columbian zebra plecos, 5 black neon tetras, 3 juli cory's and 1 panda cory. I'm wondering if these pothos roots are rotting and that is why we have this bacterial bloom. Any suggestions on how to get my clear water back would be welcome! Should we break off the rotting roots, get rid of the pothos all together and propagate for new roots? We have a UV filter but I have't added that to our aquarium as I'm not sure of the effectiveness. It's the Eliminator by Aquatop. It says it is an internal filter with UV and helps with algae blooms, but I don't think this is algae. Will it hurt if I put this filter in my aquarium just to see what it does, if anything? Thanks in advance for any help on how to get rid of this cloudy water!