Update:
Additional information :
It lays at the bottom or rests upright for sometime
Then when able swims to the top and when swimming part of the fins is out of water
Intermittently darts and then swirls (swims in circles) at a very fast pace almost violent
Sometimes has what looks like seizures
I have never seen anything like this. Not able to find any reference also.
Water Temp - 30 deg. centigrade - there is a heater on
No medication yet only Epsom salt
Please let me know if I can provide any additional information.