Hi all.
I would like to add my experiences.
I agree with Peter about the use of salt. However, I used pure sea or rock salt at the same dosage as Peter suggests.
I decided to give it a try because no spirohexol was available in the UK, and a friend suggested it’s use. I have used it successfully on P. Bintan and P. Phoenicurus as well as some black water Bettas.
It works very quickly. with no side effects. In fact, the Phoenicurus were displaying again within days.