When I turned the light on this morining my FH went crazy. it started banging into stuff. it stopped after about 30 secs. I turned the light off after that. I am thinking of putting a bliket on the tank and adding salt. I did a WC a few days ago and I don't do many in his tank beacause he is in a tank that is 30-40 gallons and it is like 2 inches with 60 gallons of filtration so he might not be used to them (he has been a little scared since I did it). I know it could get bad beacause of my pearsei that died. I am going to add salt later and put a bliket on it's tank... anything else I should do, why did this happen?