I wanted to grab one for my little planted ghost shrimp / betta tank. The price wasn't justified @ PetSmart. They are supposed to be beneficial like growing chaeto in a fuge for saltwater. Make sure they don't get stuck in place, over time if they aren't allowed to tumble they will "flatten" out from their ball shape as they grow.
Maybe they'll swell up with water? They'll grow...
Yea, they were $7.99 each, and only maybe double the size of one on those pics. I'd say for $6 that was a pretty good deal. They will grow pretty fast at that size and you'll have golf ball size in no time.
Oh wow the one's at the one in Niles were monsters then, judging from the picture the one I picked up was close to double the size of a golf ball
If you want a blob of mushy dead leaves in there, go ahead. They're good only to a SG of 1.005.
Do you have a FW tank for it?