I have a male green/blue mandarin. I have had him since 7/17. He eats frozen foods (brine and nurtramar ova). I am concerned about his appearance. He appears to be getting very fat, but only in his torso/upper body. The tail section is very skinny in comparison. He continues to be a ravenous eater at dinner time, and moves around like a normal mandarin and has no issues with the other fish. I am not sure if he has some kind of bloat or inability to expel waste or is just bulking up. Would love some input/opinions.
Here is an attempt at a diagram
Here are some bad pictures.
Here is an attempt at a diagram
Here are some bad pictures.





