I have a 75 gal sw aquarium that has been up for 5+ years now. Recently it crashed (approx 5-6 mo ago) and hasnt recovered regardless of the water changes and filtration.
We have a euro reef skimmer in our sump that constantly filters out the water, 4 power heads in the back, and we do at least a 50% water change every week since it crashed. We also have a 6" sand bed.
We just lost one of our female clowns and only have one male Clarkii left. Tons of red algae, some brown hair algae, etc. The nitrates are 220+ ppm, nitrites 0, ammonia 0, ph 8.0, and the tank is at 80 deg. We never overfed or dump chemicals in there w/o testing.
Please help :(