I’m happy to help, but I guess I’m my own worst critic... I’m still trying to figure out what went wrong with those wrasses.
I did find an article by Bob Fenner... he mentions dosing the MB directly into the freshwater dip, rather than doing each separately, but I am still trying to figure out what the actual dosage would be that way.
He also mentions specifically, that if the fish tries jumping out... the dip is over. I’ll post that part... it sounded exactly like what you were describing.
“3) Watch Your Stock! What's that, number XII? No, I'm serious, unless you've done this a bunch or are using the suggested mellow Methylene blue, stay right there during the process. Your new acquisitions might just hop out onto the floor, you never know. Actually, the only reasonable way to gauge how much may be too much time to spend in the dip is to examine the dipped's behavior. If it becomes erratic (should I offer a definition? Nah!) with thrashing about, inversion, wild attempts at missile-impersonation, time's up.” - Bob Fenner
I’ve never had a fish react that way to a dip/bath, but I’ve used acriflavine waaaay more often than MB (can probably count my MB usage on one hand...)
Whatever else I dig up, I’ll report back. For future reference, and for the sake of anyone else who stumbles across this thread