lottabubbles
Fish Fanatic
yeah you have a point. there wouldn't have been any light because the canister is down in the closed door cabinet.Don't know how long to keep isolated but I'd keep the tank fairly dark and increase the light gradually. Think about it. If living in the filter it has probably spent its whole life in the dark and its eyes may be pretty light sensitive.
it's just a good thing it caught my eye when I pulled it out because if I took it outside and cleaned it I never would have known it was in there and it would have surely have been killed.