I am also hoping to get some help with the first of many problems.
I have a bunch of this string algae on the sand and on some of the rocks as well as some kind of thick brown algae that's growing on a lot of the rocks. I don't really know enough to know what's causing it. I need to get a phosphorus test kit and see if that's it. I am using RO water, not RODI water. How big of a deal is that?