Crypt. in the maint tank will eventually die out as there would be no beneficial host for them. I agree with the refractometer and I would start off with daily/every other day 25% water changes for the first week just to make sure your firefish doesn't overly stress. Make sure there is eggcrate over the tank and indirect lighting (natural ambiance) should suffice.
This thread should really be merged with your other...
This thread should really be merged with your other...