A little less than 2 months. It is what is left from my 44 after sales. Live rock from vivid aquariums, and a purchase of a 55 that was pretty much abandoned in evansville indy. It seems to be doing well, and I have a test frag of sps. green acropora, that is doing very well. growing down the holder towards the rock and branching tips are growing out. I did rush a little more than I should, but I had to have somewhere to put my stuff. Going to try a new clam this weekend if it stays at fish store. Thanks Charlie