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my tank is about 5 months old because i moved had it a little over a year setup before that. yes it has cycled.

tank size is 55 gallons, also a protein skimmer, and a uv sterilizer, i use a fluval 305 canister filter, ph is usually 8.2- 8.3,nitrite is usually 0.50,and ammonia and nitrate is usually at 0 ppm to 0.25.

I have two damsel fish, one is mostly blue with yellow fins, and the other one is yellow on the fins and kind of a pinkish body, a few days ago i noticed that the one fish is acting more agressive than usual and it keeps charging into my livesand in the tank and making a mess of it and rolling...