If you just got it, or if it was just shipped (especially if just shipped) it looks stressed but otherwise okay. If you've had it for a while It looks like some tissue may be receeding from the very bottom on the skeleton.
I had it for 2 months.
Recently my phosphate jumped to 2.5 I already reduced it to 0.6, tomorow will reduce more (by replacing some water)
Also my calcium jumped to over 540 but ots 420 now
Nitrite 0
Nitrate like 20
Ph 8.2
Ammonia 0
So I guess some water parameters messed it up.
Should I do something or let it be and he will be OK?