I have heard others say melafix is good. The pimafix is for fungal problems I think. I dont know about the bacterial infestation in the tank but if you thought that then do PWC
`s to get to pristine conditions. I`m just not a big fan of treating anything unless I know what the problem is. The wrong treatment can stress as well as kill. The blenny could have already been sick.
Also as far as people posting if you go to this forum`s front page you`ll see plenty of people post on this forum. There is one with 25 post on it. I`m sorry you did not get the help you need but it looks like several are posting in this forum. I hope all goes well with your tank.