Sounds like you have a huge amount of nutrients in the tank, and combined with lots of light, you've got algae growing in the water column. That said, it sounds likely the tank has cycled. To be sure, test the water, man!
While there is no going back, I would suggest curing any new LR for new tanks in a container other than the display tank. That way, you don't get nutrient build up in the display tank which causes all kinds of algae problems in both short and long term.
I have never had green water in a reef, which is what you have BTW. You can probably get rid of it by cleaning the glass, removing the rock and cleaning any algae from it, thoroughly cleaning any mechanical filters, siphoning out detritus from the sandbed, then do a 100% water change.
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