Thank you Larry.

I treated the fry with Flagyl - (Metronidazole) but without any success.
What treatment is appropriate for worm parasites.

I kept aquarium fish for a long time and I am out of hobby now but I want to reintroduce some Loricarids in my tanks. I had some problems with Ancistrus fry - swollen bellies with high mortality rate, I am afraid of same problems. I bred Ancistrus species quite successfully for a few years, but ...