Thank you for your replies and for the information,now I have something to work on,he looks like a really smiley happy chap and is eating
The shop told me that it happens when they breathe too much air when they go to the waters surface.I have 6 ACF 4 albino and 2 wild coloured,the bloated one Einstein is Male.I know that I shouldnt have bought him home with me but I love these guys so much I didnt want anyone else to have him and not have the care he needed.
The man in the shop was also surprised that I wanted to buy any in the first place as they have had them in ages and nobody had bought any There was about 20 in a tank roughly 18 inches wide and 18 inches tall,no plants or hides,just piled up one on top of another,like people trapped in a lift
I will let you know how I get on