I know what you are saying , it is exhausting . For 2 years I added nothing new to the tank . I just didn’t have the time or space to do it . Yes cross contamination is so easy . I still do it by accident . I sit there like Homer Simpson “doh” . I haven’t bought from reef cleaners in a while . But every company has to be always evaluated . Look at dr fosters smith turned live aquaria turned petco turned to whatever . But with the local collectors you might have better odds . Vs wholesalers that bring in from all over. . It seems to have gotten better . Late 90’s early 2000’s everything I ordered had ich, and flukes . Velvet , brooklynella , uronema were so common . I lost so many fish didnt know what to do . So I have been burned so many times . I had to educate myself by going down so many rabbit holes . So when someone new enters the hobby . They want to see these fantastic tanks and rush and buy . And crash . They dont know all the details , it’s a ver slow process for me , I hate waiting . .so when someone says they dont QT anything . Russian roulette. . . I just know that I can’t be that way . Early 2000s who knew all of the bugs, nudibranchs , flatworms,bacteria , ciliates would decimate corals and start us dipping and treating ,and QTing . I am waiting when viruses start to be associated with coral demise . I need tostop . But overall I say QT everything . I am more inclined to buy from aquaculture supply lines that don’t deal with wild caught and are kept seperate . Love ORA but I want it before it’s dumped into someone’s system . I want it straight from the bag that they shipped it in .