Red Tail Shark Healthy ?

Hi , My red tail shark has been acting strange lately. It won't eat and it just sits around. Does anybody know if it is sick? It does have a white tut up on its tail. I'm currently keeping it in a 25 gallon tank.

 

Can you post water parameters in the tank?

(PS - You're supposed to take live plants out of the pots and rockwool)

 

Also what does it eat? Looks a little bloated maybe.

 

when I had one it ate algae wafers, blood worms and most likely ate flakes that sunk to the bottom