I googled "Olive Green Ramshorn Snails" and couldn't find anything that looked like what I caught. For sure they are ramshorns and I know it's not algae that is causing this coloration. They have reddish brown bodies and olive green and brown shells. They are multicolored and really cool! I just got two of them. A baby and a large adult. Hopefully the age gap won't be a problem for breeding. I will be sure to post pics when they get acclimated and are active!
Sent from my iPad using Aquarium Advice