Unfamiliar fish issue? Help appreciated

[Fiftyyearoldman]

My apologies for appearing to be a rookie but I have a male in my group that is starting to concern me and am hoping one of the more advanced hobbyist could give me a hand.  History , four males and 12 females in this group, lethrinops green face, breeding like crazy everyone eating fine, acting normal but one male had what I can only describe as reverse bloat, just looking for some assistance on IDing the problem.   Thank You

[Regalblue]

No shame in being a rookie.  We've all started somewhere.

Its most likely internal parasites.  Do you have any meds on hand?

[Fiftyyearoldman]

Sad part is I'm no rookie, just never seen anything like this.  Fortunate I suppose.  Treated with salt bath and three days later with melfix bath I believe it was. Always run cuprimine in the main display. 

[Regalblue]

Still... I've been keeping fish for almost 30yrs & I'm terrible with disease diagnosis.

I do however know that 90% of the time a sunken belly means internal parasites.

Do you have Epsom salt on hand? 

[Fiftyyearoldman]

Yes. Will try that. Thank you

[Kulasik]

Thx Blair, I was wondering about this topic too got some german red "teenagers" that seem a little skinny for how much im feeding them