Posted: Thu Aug 24, 2006 7:54 pm
I have to say that I have some man-made pebbles in my RES's tank--they're tan and light green and look iridescent in certain light. I got them in a craft store, and they are aquarium safe. I don't have a lot in the tank, so they don't bang against each other. I think two have broken since they were put in (about 3 years ago---my RES's head is now about as big as they are, but I really doubt he's ever going to try to swallow them). If you're going to load them into your tank to any depth where they'll be piled on each other and/or if you're rough with them when cleaning, I don't think it's a good idea.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-