I have four D120's over my grow out frag tank system and a 2080 over my display. Out of all of them the only light that replaced another light (in this case MH) was the 2080 over my display. The D120's went on new tanks that were not cycled. My display is doing great and I do find that in some of my corals the growth appears a bit different in how it grows with the LED vs the MH but just to a minor extent. In my frag tank it has been a bit of a WIP but primarily because the system needed to cycle. I think moving corals from one light source to another and to a new tank that has have <6 months to stabilize is a major stressor. I have coral that are doing well now in the tank but the exact same coral did not survive once first introduced.
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