Ha! I thought that would get your attention! Ok, thats not my picture, I stole it. Thats a pic of them in the wild in the only place in the world they come from, a lake in Japan.
First time I ever saw these was when Tom Barr sent me some last year, at that time they were not available from commercial sources in the USA.
But then a couple of months ago, Florida Aquatic Nurseries got a hold of them and started distributing them to their retailers and distributors across the country. Its unclear how much longer they will be available. Tom, did you or Karen Randall have anything to do with FAN getting this plant? FAN seems to be now importing more rare and unusual plants periodically, something they never used to do.
Mine are golf ball size, and pretty darn neat looking! As part of their photosynthesis, they sometimes float up to the water surface for a few hours, then sink back to the bottom again.
And no, I don't only have one, I have a whole tank full of them and I'm selling them. Even in the picture, all of those are algae balls, not rocks!
They seem to be easy to grow, under low light or high light. I do not know if temps, water hardness or other factors come into play or not, maybe Tom can shed some light.