One of the problems with superverm is that it has to be redistributed into smaller bottles. If its not consistently mixed in process, then it is distributed into these containers with some bottles be stronger while others are weaker. The next thing is, this stuff should be rolled to mix, not shaken. The air mixed into while shaking can throw the whole off as well. Too much, burned fish, not enough, not going to do the job. Then toss in the fact it is gallon specific med and you got a real mess!

Nasty stuff!
Brutus, I'm sorry you lost fish, goldfish hybrids or no, that alone would have thrown me off not using it.

It isn't worth the risk weather its goldfish or hybrid. I do not advocate superverm and the more I see of these problems cropping, the more I advocate prazi use instead.
There are still folks who claim their goldfish are just fine... well, I still won't advocate its use period be it koi or goldfish or both. But you all have to realize that you take a risk with any medication, they all have side effects to them. Then toss in the fact that someplace down the road more are likely to show. Let me just point out here that how many years was some of those wonder drugs heaped on folks that made them happy normal folks for a few years only to have the drug reverse itself and folks went "postal"? Chloramine T can burn also...
So a lot of folks say Mela is useless... well, the key word is antibacterial, its not going to stop whats already there! Theres a time and place for anything, and proper use of. So when I read something that say's persay its toxic to goldfish, hybrids come into that category also. Lean to the side of safety and caution I say. What works for one person, may well not work for the next and for the person following after could well spell disaster! Make sense?
B.Scott, with all the problems we have been seeing of late, most of us are not advocating its use, however, in some country's its either superverm or Chloramine T, or choice of the two, that is available and most of us go out of our road to make sure the poster knows what can happen! Its a catch 22 if you follow me on that.