1 X 400mg tab/40l for 10 days at 30-31deg works a charm!!! lights off and towel over tank- (to keep them from freaking out).

This was advice from someone i completely trust with vast medical experience, and a long time fish keeper/breeder... and he didnt let me down 100% success rate for the customers fish, and the other EIGHT they infected!!! these fish are now the biggest pigs of the lot at feeding time, and already looking fat!