LFS has some lr for sale that is in their display tanks. it has been setup for a few years and they add to it as they sell it. some of the pieces have a nice "grown" look to them and some have some corals and things growing. my question is i will be setting up my tank in a few months from scratch, when it comes time is this good lr to buy will my cycle have a jump start since it is already in a mature system or will it harm the stuff living on it. will still not add fish for few months either way till i get the hang of an indoor setup, but dont want to spend a little extra per pound if it wont mater thanks. also first store i went to said lighting for tanks with corals starts at $1200 and the second said coral lights start at $169 which seem closer? thanks