She did say though that she is buying another bigger tank soon, so there shouldn't be that much problems then?
Since she plans to hand the hi fins to you and hasn't said how big it will be one could assume it's not going to be more than your 100g I could easily be wrong though.
I don't think she needs to get rid of all her fish, because by the time she gets a bigger tank they will be suitable for that tank. She also said earlier that she will give her hi fin sharks to me, so that should solve that problem or am I wrong?
Are you the fiance with the 100g? It will solve the problem for her, but you'll be left charge of finding them a new home.
The fish are still very very small, not even an inch long. So they will survive another month in that tank. But please correct me if I am wrong.
Are you sure? They look a bit more than an inch to me, could be the photo though.