Here r some pic's of alex he/she (Im not sure yet any help on that too would be appreciated) use to look just like your first picture ive recently moved alex to a bigger tank now its losted all its gills eyes have gone kind of foggy and theres very little movment at all and no eatting. Im asking you cause it looks just the same can you help
It looks like hes going to morph, because of the gills and the "outstanding" eyes.
Have a look at his mouth. Maybe he got problems to eat because hes getting a tongue.
The "fogg" on his eyes could be harmless bacteria. My axos got this too. I put one bag of black tea per 1l into the tank for about a week and it was off.
You said, he has been moved into a bigger tank.
Do you took the water from the other tank into the new one?
Do you analysed the water? Is the temperature the same?
What do you fed him?