Help Before My Puffer Dies!

[BecciMac1987]

Help- got up this morning and Burt is sitting on the gravel with his tail wrapped around him so he is in a little ball, swimming in circles. Ive also noticed that his belly has gone from pure white to having black blotches.
This happened to Elmo before, but I assumed he was just a poorly puffer. Ernie is still abs fine.
Should mention, they are brackish green spotted puffers, about 2" long.
Anything I can do?

 

[smudger72]

Help- got up this morning and Burt is sitting on the gravel with his tail wrapped around him so he is in a little ball, swimming in circles. Ive also noticed that his belly has gone from pure white to having black blotches.
This happened to Elmo before, but I assumed he was just a poorly puffer. Ernie is still abs fine.
Should mention, they are brackish green spotted puffers, about 2" long.
Anything I can do?

Well.........
Give us all some more to go on
Tank size?
Water quality? Have you tested the water?
What SG are you keeping it in?
As much info as possible.

 

[BecciMac1987]

Tank is 120l, sg 0.015, water tested at local LFS and its perfect. Since I posted this morning (soz for lack of info-was having a mad panic!), he has straightened up and has just eaten well. I dont understand!

 

[Fella]

How long has the tank been set up?

 

[BecciMac1987]

6 months or so.