algae growth

I have had my tank for almost a year and only have fish at this time. My back glass had some green algae but what’s in the pics starting to grow recently . Also I am not sure what those white dots are. There is also some white green foamy stuff floating in part of my sump. Can someone help...

I have a 16 gallon Biocube tank that I just started I bought 20 pounds of live rock from Tampa Bay Saltwater and have had them in my tank for about 5 days now (waiting for my tank to cycle) however there is now a green algae growing on them that was not there before is this good or bad algae? I...