My fish? Floating upside down then going crazy?

What-A-Secret

New member
Last night one of my glowfish died.
Today I just cleaned the tank (with my python). They are new to this.
Now, one of them is laying on the bottom like he's dead. I really thought he was but then he moved else where and he's not moving again.

The other one is floating belly up at the top of the tank like every dead fish would do. I thought he was dead but I put food in there and he went CRAZY then stopped mid tank and floated up to the top, like a sudden death. But then he did it again!
So Idk what to do and I don't know what's wrong with him. The other fish is fine though (besides the one at the bottom of the tank)

So what now? I think they are in shock but I'm not an expert, these are my first glowfish.

None of my other fish have ever done this.
Now he's swimming to the bottom and floating belly up to the top again lol over and over and over again. Is he just messin with me? That silly fish
 
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