Hi John,
Do you have a
QT tank? If you do you could stick them in in
QT until the parameters in your tank are OK. Here is an article
Reefreaders - Quarantine Now! that will help with how to
QT. Otherwise, at this point all you can do is frequent water changes and hope for the best.
Have you ever used any
copper based medication in the old tank? If so you would be better buying another tank and just keeping the old one for
QT because the
copper is really hard to get out.
I stock my tanks lightly but most of the fish on your stocking list are pretty small so with the
sump and 3 chromis you would probably be OK. In my 54 I have a 3" maroon clown, sixline wrasse and a firefish. I'm planning on adding a cherub angel and a mandarin and, maybe a lawnmower blenny. My nano came with a chromis and a percula or ocellaris clown and I haven't decided exactly what I am doing with it. If I decide to add the blenny I will probably move the firefish to the nano.