We went away for the weekend, and on Friday morning when we left all levels were perfect. Ammonia was a lil high at just under .25ppm. We came home today and we could barely see the fish in the tank!! The ammonia was between 4-5!! We did a 50% water change and the fish are still ok....but we are lost as to what happened and what do we do next??!! Please help! I posted a picture as well.
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