Went to the room yesterday and realized these Spirit51's are getting quite tall. So, I pulled out the ol' tape measure and sure enough, 2 of them are over 2 feet tall (27" and 25") and one is at 18". WOW! :clap:
They're still pushing along at at between 730-750 ppm at 5.9 pH. I'll be heading away at the end of this week for 10 days or so to go to a wedding, so it'll be neat to see what they look like when I get back.