I know that these can be aggresive sometimes sending out "sweepers" that might sting neighboring corals; But what about another hammer coral. I just finished a maojor tank overhaul which always results in a layout design. I have 3 frags of branching hammer with 2 heads on each. If I group them together will they sting each other or just different spieces of coral?

Also has anyone used the Texas holey rock in thier reef tank? Good/Bad just another rock?