hi, my mates got small fish tetras etc but they seem to be fine when she byes then but after time they go really skinny and hunch back and die dose anyone know what it is and how to treat it cheers.

It's either or both of camallanus worm/internal bacterial.

Treat with interpet no.9 and flubenol 15 together, common problem, the shop/wholesaler hasn't quarantined them before sale...................................

Cheers Granville

thanx 4 that ill get um to give it a go .