Yeah, unfortunately that some some hair algae. Ive been having issues with my cheato not growing and dieing and ever since the hair algae has started to sprout on a few rocks. I just cleaned most of it off actually, but it'll be right back soon.
Flow, not enough. theres roughly 900gph in the display. Upgrades will be when I switch to a 125g tank and get to redo everything fresh and drill it.
I agree, the valley is more natural looking, but its boring to me. Everyone has the same old thing with a pile of rocks and some corals on it. On the next tank I will be going back to the valley, but there will also be a few pillars to help keep it a little different looking.