Thanks for the advice. The fountain is colored concrete. I had been using chlorine (maybe 1X every 2 weeks, every once in a while we'd forget and it would be very green and then have to do a complete shock/cleanout). I'll switch to you recommendation and I guess 1X week is what is needed.
Someone might have to invent a drop in algeacide drip dispensor. Something like an IV that you hang over the side of the bottom pool so it can be more maintenance free... I'd buy one!
Thank you very much.