I got some new fish and apparently they were carrying ick. I've had one fish die and another is broke out. My betta lives in this tank. I put ick medicine in and read on the bottle that some fish can't tolerate it. Is the betta one of those fish? The next morning he kept getting sucked up to the filter like he was weak. I have taken him out and put him in some fresh unmedicated water. He doesn't have any signs of being infected. I've had him for a long time and don't want to lose him. Are there any other fish that don't do well with the ick medicine?