That's a high bioload tank with bright light. Not in a bad way, it looks fine but the engineering must consider it or you'll be hand cleaning too much to enjoy it.
Buy an oversized uv sterilizer from
Amazon, hook it up creatively, ship it back if it doesn't help. These are fine cheats to offset suspended diatoms or algae, and they do work to reduce your work. Oversized but still fitting... Lookup YouTube videos on them to see installs on small tanks. Uv is an accurate hardware consideration for high bioload systems for a few reasons chemically and physically.
Clearly it works without one, you may not want to buy. It's just a work reducer, not required, just an effort booster for clear water and glass.
You can decrease white light up the blue to begin change alternatively
Full water change, consider that, I've done a thousand full water changes so that covers all questions regarding their safety. With fish, we'd be creative and do 90% so they could swim.
Lower overall light intensity until coral covers most surfaces. As of now, surfaces are open for colonization. Those that float there through the water land first
This cycle is playing out over and over
Lastly, if you didn't rinse your sandbed, that's contributing
Covered here
http://reef2reef.com/threads/the-of...ead-aka-one-against-many.230281/#post-2681445
Consider force cleaning the whole tank if no uv.
Clearly something decisive is needed, or you'll have to just continue work as is