Algae ID?

Thanks all for your insight. I have removed all algae as best as possible and will continue to monitor.
Myka (Mindy?)...thank you especially for taking the time to provide your advice. I so appreciate it.
In tests, my water seems to show good results, except for slightly low calcium and Kh...but I do see detritus build up on some of my rock and I have started to see a good deal of algae growth (besides what I photo'd)
My skimmer pulls a lot of skimmate but I am running an RSM 250 and with no under tank sump - so I am restricted to a nano skimmer (I use a Nano Reed Systems skimmer).
In addition to the stock powerheads I have a couple of MP 10's so flow is pretty good...butmaybe a couple of dead spots.
My tank has been running for about a year now and I have not lost any fish or corals (besides one hammer frag that tore away from the stalk for some reason) but growth has not been staggering either....other than daisy polyps which have spread almost out of control! The one Zoa (pictured|) I keep has remained about as sparse as when I got it and even though I like these Zoo's - I have been reluctant to get more because of this.
I have maintained 15-20% water changes every week or 2over the past year and I have changed T5's once so far.
Have I missed something? When you say nutirent load -what are you referring to exactly?

Thanks
PatD