Is your 10G ready? Cycled?
If I was you I will put all my fish in the 10 g ( if is cycled even better ), run to get the 30G fix, put the substrate and the filter media in a bucket wit tank water trying to preserve the bacteria.
If the tank get fix soon, I will re start the 30 with the gravel and filter that is in the bucket, and read water quality, then transfer the fish back from the 10G.
IMO