4FordFamily
Tang, Angel, and Wrasse Nerd!
X2 this is exactly what I was gearing up to write.
Unfortunately your choices are large losses or proper treatment if velvet. Minute chance (but possible) that your fish become immune to velvet by some sort of stalling medication that keeps it at bay but you're more likely to do damage to your reef and most importantly much more likely to kill almost every new fish you add because they'll be so stressed from collection, transport, and shipping through the distribution system that they are a sitting duck and within days or two weeks at a max they'll all die when added.
Any stress event at all puts your reef in dire risk and you'll have only a day or so to react when it gets serious and flares up. In the long run you're almost guaranteed to lose all fish but perhaps a hardy wrasse and maybe goby.
I know you don't want to hear this... but I agree get a larger quarantine. It's a lot cheaper than losing it all :/
By the way - I've been there and done that - I understand!
