How skinny is skinny?

[Sophia]

Hello, I have had 5 dwarf chain loaches for a few months, and just wondering, when you refer to a skinny loach, how skinny is skinny?
Of the 5, 3 are fat and slug shaped, 2 are more snake like in thickness. Is that simply the difference between a male and female or might the skinny ones have worms?
Is hard to get a clear photo as you know, but in this one Mr Skinny (the skinniest) is the one looking at the camera on the right. Left to right there are 3 fatties and the one next to Mr Skinny has the same body shape but a little thicker.


in this one Mr Skinny is on the left, biggest fatty in the middle and smaller fatty on the right


thanks

[Sophia]

I treated the skinny fish with levamisole on Saturday and he died yesterday.

[fain]

I'm sorry for your loss.
Are the other loaches still well and plump at least?

[Sophia]

There are 4 left - 3 are plump like little fat slugs and eat like pigs. The other one was nearly as skinny as Mr Skinny before he went downhill but last week he seemed to start filling out a bit more. I have given them a dose of levamisole this afternoon to see if that aids in any way.