For the CUC I will get some water out of the tank and swish them around in that and repeat that process a couple of times. I consider it a low risk. I only buy my CUC from Reef Cleaners and John does not deal in fish.
Perhaps I will get flamed, but I think some folks take things to the extremes for very little gain. That is their choice and nothing wrong with it. Just not my way of doing things.
I will say that when I first started I had a bumpy ride and after a year or so found Reef Central. I then went the QT everything wet route out of fear of pestilence and plague. Over time I got more comfortable after reading about the common illnesses, parasites and the such. I have since developed the protocol that I follow now and have not had any issues in my DT. Can I say I am 100% ich free, no I can't. But, I can say that I am confident that I do not have an issue with ich, velvet, brook, flatworms, redbugs or any other nasty's. Just my 2 cents worth.