How long are you supposing that this new vivarium will be finished? I wouldnt prolong them living together very much longer in that small of a space. I actually dont even suggest housing them together in a bigger enclosure. Males are very territorial, on the other hand you have no females correct? If you had a female they would need to be seperated ASAP. I have never heard of anyone housing two males together without some sort of altercation, really your best bet is this... build your new enclosure as quick as you can, move one into that enclosure, and keep the other one in the 100 gallon. If you dont take my advice, which you dont have to, and end up putting them into the new enclosure together, move them in at the SAME time! This way, neither one has established territories yet, but you will still have the more dominant one. And if injuries keep occuring, either adopt one out, or seperate, cuz it wont get any better most likely.