Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Booo! Don't buy!!!

I thought it was the generic cheaper filters I was buying and or algae chips I was adding. The frozen food maybe? It took me a while, by process of elimination and a lot of time to discover it was this product I was adding. Turns the tank cloudy. Takes day to recover. They should test this product first before releasing. Thanks for the other honest reviews to confirm this. It helped me find the root cause.