Is there any live rock from your friends system in the 12g with the tang? exactly what is in that 12g?? If not then you will need to do a lot of water changes (shouldn't be hard with 12g) because there is no beneficial bacteria culture.
As for the 30g, if you do happen to have cycled live rock from your friend you can plunk that into the 30g assuming the rock wasn't out of water for too long. Observe any ammonia and/or nitrite spikes by testing daily. You may or may not have a spike (mini cycle) with the old live rock in there. If you don't notice any within the first week(ish) you should be okay.
If you have no live rock present and are truely starting from scratch then I would recommend finding someone locally that can babysit or adopt the tang while you set up the new tank as it will take a few weeks before it is ready. It sounds like the tang is already stressed quite a bit and his immune system compromised. This means he is extra sensitive to any amount of ammonia and/or nitrites which is not good..
Anyway good luck, hope he pulls through.
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