Originally Posted by anonrider12
so i came back from work today and my 55 gallon was all cloudy and majority of my fish where either dead or barely in alive. what in gods name could of happened? just last week my parameters where all within in the normal range. what should i do now? break down the tank and start over or water change and keep going?
This is hard to tell without knowing some history. Your parameters could have been fine last week but your pH could have dropped, temperature variations, lack of water changes, overfeeding, filter issue raising your ammonia etc