Algae Identification and how to handle

lost66

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Recently my tank started to build a thin film of green algae and eventually some rocks are covered with thick spots of algae. Hard to remove, brush - even metal - doesn't do anything and it comes off hardly using fingers. Anyone can help me with identification and plan to attack?

My tank is 240g, 2 years old. I won a year long battle with dino few months ago. My tank matured and parameters are stable and current level of phosphate is 0.11ppm, nitrate 0.4ppm. I don't test for nitrate and phosphate very often since tank looked beautiful and some green long hair algae was only present in the overflow box and in the sump with chaeto. I haven't notices crabs, snails or tangs picking it up but maybe I don't have good CUC in my DT. Everyone recommends like hundreds of snails/crabs but whatever I add, they seem to disappear and I don't know if they are hiding, I see maybe 20 of them crawling here and there.

My cheato light died 2 months ago and I replaced it with something else and from that moment I started to see decreasing population of chaeto so my hope is chaeto was dying because of bad light and there was not enough of it to suck all the food and give a chance that green stuff in DT to thrive.
Yesterday I installed new chaeto light and run it 24/7 hoping chaeto will reborn and overcome other algae - do you think it is the cause of the situation?

I took some pictures using more white light to show true colors and I used my cheap microscope to try to look closer if that helps.
I am losing my mind here, I have no idea how to handle the situation.

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Most recent picture of the whole tank so you can see how many rocks, fish I have.
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