Get them back in the main tank if the nitrite readng is 0, as i don't like that reading in the hospital tank, don't forget to check ph and temp to see if you have to climatise them again, good luck.
Thanks for the advice ...Yay they seem much happier and are swimming around alot more. I guess the stress of moving homes took its tole on them ..Hopefully their color will come back and start eating again.