What should i have it there? How much LS?
Pretty much keep nothing in the tank except a piece or two of PVC
for the fish to hide. Don't put ANY LS
in there b/c if you treat with copper or any other medication, it will kill the LS
Simply fill up your QT the first time with water from your main tank. Then, all other WC
's should be made with fresh SW
. The reason for filling it up the first time with water from the main tank is so that your fish will feel a little more at ease going into a small tank versus brand new water, new tank, new surroundings, etc. and stressing out the fish.
I would start off by doing a 30% WC
every other day until the main water is gone from the tank (in a 20g, usually about 2 or 3 times) then you can back it down to the normal 15-20% every other day. Check those levels daily and keep low
lighting (about 1 hour a day, if that), and feed only on the days that you're changing the water. You want to keep your fish as stress free as possible and keeping the light off is a good way. Feed in the AM or afternoon and change water at night. That way you can remove all uneaten food frin the tank and your levels won't go up.
I know it stinks, but keep your tank fallow for 6-8 weeks. The last thing you want to do is to put your fish back in the water and have them reinfected b/c you didn't wait long enough.
Keep us posted.