Since your 30 gal
tank is FOWLR
and you are still treating fish with herbal ich medication, you can keep your parameter in acceptable level with pwc
weekly until you have your 55 gal
back in place. Just keep in mind that the 55 gal
has to be with no fish for about 6 weeks in order to completely eradicate the ich in it. Not much to worry about if nitrate is just below 80 in 30 gal
but you have to keep watch on ammonia and nitrite. You might have to reduce feeding a little bit. Forget about the cheato for now.