I did similar but I went and actually killed "everything" on the rock. I put mine in a trash can and put a swimming pool tablet in with it. Left it in there for a couple of weeks and then did several fresh water cleans of several days each (pump circulating) on the last two. It was now basically dead base rock but that was fine for my needs and re-seeded with fresh live rock. Been up and running now for going on a year with no problems.