Hi, I cant get my nitrate levels to come down from 50 mgl! Recently i have been doing 20% water changes weekly and still it stays high! my params are as follows, S.G= 1.025 TEMP= 25C PH= 8.2 AMMONIA= 0 NITRITE= 0 PHOSPHATE=0 NITRATE= AROUND 50 MG/L!!!!! My tank is 130 litres or 35 gallon- red sea max 130 d. I use R/O water with a tds of 001. I am running rowaphos phosphate remover, and seachems purigen to help lower nitrate (doesnt seem to be helping!) I use a protien skimmer, and have 25 kg of live rock in the tank. LIVESTOCK- 2 common clowns, bangaii cardinal, and a small regal tang (i am planning on removing him once he gets too big!). 10 hermit crabs, 1 emerald crab, 1 cleaner shrimp. 1 moon coral, 1 finger coral. I really am going insane with this! I really dont know what else to try! It is a constant battle with algae and its really getting me down. I really am trying my best but feel im fighting a losing battle. Please help.