Yea - I think I have learned a valuable lesson!! :eek1:
sorry to be the bearer of bad news even if you QT your next achilles and it goes in the same tank it will still end up with ich. Reason being you had ich in there and will still be in the tank. To rid the DT of ich you need to QT and treat all the fish in the DT and leave it bare for 6-8weeks killing off the parasite. I have learnt this the hard way.