Emergency cycling of new tank

I've set up a new 240 gallon tank, one week old with 100kg of uncured live
rock, the first two days the whole house stank, now there is no smell and
many different types of macro amd hair algae is growing.
BUT my 4' tank that has been running for 3 years and is jam packed with
corals and two small tangs has cracked right across one whole side, I think
that its going to give way any second, can I move everything into the new
tank now?????

I'm pretty desperate and extremely worried about the whole thing, I have
been so patient with months and months of DIY building and planning and now
this happens one week after LR being put in.

Any suggestions please? Will everything die if I put it over?