Thanks for the advice Peter,
I’ll look out for flubernole but it seems to be listed on the internet as a pig wormer.??
Is the threat of hydra simply for predation against fry? My tank seems to have a lot of little unidentified inverts and I suspect that is good for micro predators such as paros. I’m sure if I use the treatment you have suggested these inverts would die also.
How big a problem is Hydra really? Is it a sign of good water quality or maybe poor water conditions? The presence of these small animals suggests to me that my tank may be ready to accept fish soon.
Anyway, will keep you “guys” 🙂 ….and dolls updated.