So my panda corys (3) are battling a case of mouth rot. I put them in a hospital tank and did two rounds of Maracyn over a 2 week time span. I didn’t want to put them back just yet, but at the same time my hospital tank is small. I decided to move them to a temporarily empty, fully cycled 5 gallon betta tank to let them maybe heal up a little more. The one cory that had it pretty bad seems to be getting better, but the smaller one in the pictures still looks bad. I’ve euthanized fish (clove oil) that were basically dead already, not wanting to prolong the inevitable, but I’m not sure about this. He tries to eat, he’s active, but it just looks painful. I feel terrible for the little guy. Do you think I should do it?