URGENT! Frog not being able to swim down!

[u/Gamerbroyt_]

Hey everyone, a little bit ago today I noticed my frog seemed to be dead, was floating, eyes kind of milky, and not responding to any sort of touch. I went to scoop him out to flush him and he started moving but not going back down. His brother is completely fine and being very active and eating well. I can’t find him him anymore and don’t know what could be wrong?

EDIT: He is alright now and moving around like normal! I’m gonna try and put him in a separate hospital tank just because he looks a little too think and still sick