adding 10 inch live rock coral....cycle?

[C0rp]

My 75 is going on 7 months old...DD has a nice 10 inch zoa rock I've had my eye on. Would adding a large rock like this cause any potential of a cycle when added? Current tank is 120 lbs rock with 4 inch DSB. Thanks.

 

[BeanMachine]

My 75 is going on 7 months old...DD has a nice 10 inch zoa rock I've had my eye on. Would adding a large rock like this cause any potential of a cycle when added? Current tank is 120 lbs rock with 4 inch DSB. Thanks.

I wouldn't worry about it. Go for it. I think removing rock is more of a problem and the bacteria keeping up with the bioload, than adding a little.