While I'm cleaning the tank, the fish was put in a small bowl with some of the old water... I've cleaned the tank enough times to know what happens.. The fish start to freak out after a while.. and the temperature of the water drops quite a bit... and depending on how long it takes to clean the thing, and how quickly I reintroduce the fish into the cleaned tank, the fish either spaz out when they get put back in the tank, and swim super fast for a long time, then just crash, and die, or they go really, really slow, and go around in circles for a while. If they spaz out, they're gonna be dead in no time, no matter what. If they're going slow, then given enough time to just swim, they go back to normal. If this was a tank for fish, I'd care more about their heath, but this is for Ned, and those fish are food.... In this clip you can see the fish is in the slow, circling phase... problem is, I put Ned back in there...