Questions - Need some input

in the next couple of months i will be upgrading from my 40 breeder to a 75, i got a deal i couldnt resist. In the 40, i have some aptasia, not out of control, but i still dont like them. I am also fighting bubble algae right now as well. I would love to not have these issues in the new tank. Since i know ahead of time would it be a good idea to cook a good portion of my rock, or would it make more problems upgrading to a bigger tank with less "live" rock. Also, how would it effect my ...

My RBTA's are thriving in my tank, very large and has split once and now i have 2 large RBTA, both are doing great. My GBTA on the other hand has been in the tank longer but will not grow or thrive like the red ones. I figure if it is not happy with its current tank location it will move to a better spot on its own. The green is lower in the tank and in a lower flow area, but wouldnt it move on its own if it wasnt happy in that spot?

Any ideas or suggestions?