Size of QT for tangs

[harndog]

I have a 175 display but it has about 150 lbs of LR. I bought a sailfin about 6 inches and a hippo about 5 inches from the lfs. The sailfin has been in there system for almost a year in about a 40 gal tank and is doing really well in her new home. The hippo however has ich. Now it's in my system. I think I need to do hyposalinity so I was thinking about getting a 20 gal tank and placing it under my 175 beside the sump for my QT. after I get the desired amount of fish in my tank I would like to switch it over to refuge. I do not intend on using copper. would the 20 work for these tangs. Won't catching them in the big tank stress them even more??? I so wish I had just added the blue like I was thinking and added the sailfin later. She is a red sea sailfin and she was quite expensive. Serveral people on here and of course my LFS said it would be better for the hippo to add her with a partner. No I am in a delima. The sailfin has no visable ich and they are both eating very good. Dry seaweed and all. She looks so healthy except for those spots. Dang ich this sucks.

 

[beth]

That is too small for 2 tangs for a month, I'm afraid. Perhaps a 30 gal rubbermaid tank....at the very min. It will not be easy to maintain tangs even in that size. I have seen long storage bins at home depot that are heavy duty, but around 4' long x 2' wide. This would be better, and then perhaps after the treatment you could just use this to store your supplies, or whatever else?
These size tanks need space. When you setup, use water from your display to fill the QT, and, of course, aged water to refill your display.
Cute dog!