Help identifying algae

[Powersds]

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 identify and what the solution is.
Thanks

 

[blaxsun]

The white dots could be sponges.