So i have a 10 gal qt tank its fully cycled and has live rock. 5 weeks ago i got 3 small fish i put them in. I noticed there fins started to disappear slowly time not fin rot but clean breaks of the fins and i never 1 time seen the fish fight in anyway... the first fish died 2 weeks after he didnt eat much at all then 2 weeks after that the 2nd fish who been eating good died and had no fins left. Now a week later i still have the 3rd fish alive and eating but fins are broken off and looks terrible my ques os this maybe some disease did the fish just not do well in the qt tank? Again there is no visual signs of anything wrong except fins broken and now some poor coloration