[Birdlady]

Ich only affects fish, not inverts or other critters.

I would NOT put any ich meds in a system with live rock or sand. JMO. Some claim to be safe, but.....
Copper is deadly to rock, sand , inverts, snails etc. DO NOT USE IT in a display system.

You should try and dip and then quarantine the fish. A small tank is not that expensive, and you should be quarantining all new animals anyway. How many fish do you have?

You could also, play the odds, and if your new tank will be set up soon, just wait until you are ready to move the fish and treat them prior to adding any fish to the new system. It will be easier to catch them then. That is risky tho....they could die before then.

All your other livestock but the fish, will not get ich. Fish only disease so don't worry about that.