Woke up and saw my fire fish wasn’t in his usual hideout and was instead in the middle of the tank lying on the ground. I saw a black spot on his fin and thought maybe he hurt himself. When I got back home he was doing way worse and was bottom up. I took him up in the net and found a massive isopod on him. And of course with my luck when I removed it it got back into the tank. I’m assuming this isopod came from my KPA live rock. Need advice on what to do. I don’t have another fish tank to put him in but he’s in a little Tupperware floating in the tank with holes for flow. He is breathing on his side but not swimming or eating. What Is the best option for my fish and tank