All you need is a small hob
filter, preferably one with a biowheel and some pvc
parts to be used as hiding places. Ideally you would put the hob
filter in the main tank/sump for a week or two before use to colonize it with beneficial bacteria. If you don't have time to do that just prepare enough sw
water for 2x/day PWC
in the QT. Check the ammonia and pH levels there several times a day if possible. The parameters can change quickly in a 10 gal
, but with just a single fish in there you should be ok.
What good do you think will be achieved by putting the RG in a QT now? If it was carrying Ich, then the parasite was already introduced into the main tank. If it's to protect it aggression,removing it won't prevent it from happening when you re-introduce it to the main tank again.
Do you still have 2 Yellow Tail Damsels, 2 3 Stripped Damsels, 1 Blue Devil Damsel, and 1 Yellow stripped Maroon Clown Fish?