He started wandering yesterday. Around lunchtime today his stomach was prodruding and he was just rolling around with the current. I placed him in a mesh container for injured fish to keep the shrimp from getting at him. I was hoping he'd perk up, but now he has turned himself totally inside out. I switched off the powerhead and filter a moment ago, and I see some very miniscule movement in his (completely deflated) tentacles. I don't want to take him out while he's still alive, but I don't want any toxins to harm my tank. When should I remove him?