Agreed, first is Aiptasia, a somewhat nuisance anemone, that can spread rapidly. The red appears to be a red turf macro algae which can get out of hand quickly.I know from experience it's also being discussed here. Not to sure about the little green guys without checking the books. Hope this helps!
Seems I have a lot of tiny white/transperant little things on my glass. They seem to have a round center with 3 to 4 / 5 little legs ( I think ) They are much to small to take a picture though I did try.. any ideas?
idk what they are called but I have thing that look exactly like your description, and have had them for years in my reef tank... never seen any harm done by them
Those look almost identical to what I have in my tank... idk about the OP, mine just have less strings per leg, they don't look that delicate and thready..