I posted earlier about my male betta having ICH. Following the advice of someone on here I drained out 50% of the water and put the filter cartridges back in. But when doing so I notice a small see through bug crawling on the inside of the tank and the fish kept going at it! After looking it up, I believe it was a fish lice! EWWW Needless to say, I took him out and put him in the smaller betta aquarium and am completely cleaning and redoing the other tank!! All I wanted was a beautiful betta to watch and help relieve stress and all it is doing is causing more!!