no i wouldnt think soo. either way your gonna have to wait until its completely cycle whats a week to you when you've waited a couple months to cycle GL
You will probably find some huge worms living inside though. Large rocks are more valuable than smaller pound for pound. Perhaps you could trade your larger rock for more smaller ones
I'll add in my 2 cents as well and say you should be fine. Alot of people chop up their rocks all the time either for them to fit properly or even just for different shapes. Good luck
k thanks for all the replies everyone I just want it smaller cause it's in my 5.5g and it goes from the front to the back. I just want it like half that big so i can stack it or spread it out more... i hate not having any open sand bed hehe.