Okay so a few days ago I noticed my scooter blenny go crazy like it had been massivly spooked and then started to go back to normal. Then on Saturday just before we were going out I noticed the roal grammer was looking week and then it got sucked into the power head, we had to go so just hoped it would be okay when we got back. When we did get back there was no sign of the grammer and the blenny was very flow and heavy breathing. I quickly caught it and added it to a quartine box inside the tank to get a QT ready however by the time I was ready to transfer (5 or so hours) the scooter had died. All other fish were looking fine at this point. The next day noticed the clowns rubbing against the algue scraper and so started to suspect flukes and thought would into it more and get some medication for it. Got some medication today and when I got back from work the clowns had gone from fine to go being at the bottom of the tank and then going crazy and also buring the head into the sand. I caught them up and moved them into the QT along with putting some prime in and flukes medication. A few hours later the wrasse was swimming upsidedown and also going all over the tank without any control. I have now caught him up and also put him into the QT. I literally only have a cleaner shrimp and engineers left looking okay at the moment but I don't know what it is because flukes I thought shouldnt be wiping fish out in a day or two of showing symptoms. Anyone got any idea of what this could be? All the fish were eating fine and not looking weak before looking like they are on deaths door or dying! We have also noticed that one of the clowns has some slight silver scales and the scooter did have it