Hi, I've had my system running for over a year now. It's been doing well. I have a 300 gallon fish tank, two 51X51 media beds, two 51X51 floating raft tanks. Recently my ammonia levels rose to 0.50ppm and the nitrates are 160 or above. Nitrites are 0ppm. I have approximately 50 mature Tilapia in the tank. How do I get that ammonia level down? And is the high Nitrate level a problem?
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