From your previous posts, you have alot of live stock in a 50g.
"Torch Coral, Xenia looking coral (don't remember name)
Anenomes: 2 bubble tip , 1 long tent.
Fish: Yellow Tang, Flame Angel, Maroon, Tomato, Pink Skunk, false perc clowns, Bangaii Cardinal
2 Urchins"
These will all add a lot of nitrogenous waste to the system. Heavy skimming and frequent water changes are probably your best options. If you feed frozen foods, make sure you rinse it first to remove the juices.
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Brad
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