Brightwell's product is said to now do the same thing as Tech-M so I'll be giving that a try.Yes, I have tried the Tech-M and brought my Mg levels to 1800 which took out most of the snails. I believe the Tech-M no longer works due to a change in the formula years ago.
Fluconazole works as long as it's left in the system IME.
Other than killing off your poor snails did it affect the Bryopsis at all?