Dear sick fish,
In my opinion, ur prob is becoz some digestive prob which have been in the fish itself for sometime... I would like to recomend u 'SWIMBLADDER TREATMENT' number "13"... u can give it a try... I heard from my friend which has something similar as ur prob and he told me his fish is in good shape after using it... Hope it helps u too.. May ur fishy be well and happy...