Newish tank lost most fish

[Pesc]

Hi, I'm very new to this world and have had a reef tank for about 6 months. Everything looked beautiful and healthy until I bought some new fish and within a few days I lost a large tang, then another and so on. Apparently the fish died from marine velvet. I only have a few fish left and am at my wits end. Do I need to empty the tank completely and QT the corals as well?

[TokiHacker]

Water parameters?

[ClownNut]

just QT the fish and leave the DT with no fish for 8 weeks. you should be safe at that point. just QT all incoming fish will help to reduce the chance getting velvet again.

[nereefpat]

my understanding is that velvet is quite nasty. unfortunately you learned a lesson about qt the hard way.