The Puffer Forum

Sorry.

Tank size 5x2x2
4 silver sharks -3"
3 gourami - 3"
1 angle
1 elephant nose
1 plec 9"

& he's 13" the tank has been established for 18 month,
Regular water changes & nothing new added to the tank.

Help/advise please.
I know someone who's mbu puffer has suddenly become ill.
It is laying upside down & has developed what looks like a lump in it's stomach.
Has anyone come across this before & what are his chances of survival?