It's a reptile watering dish......
I double boiled to insure the antibacterial properties didn't leach out,
soaked it in bleach then soaked it in Kent dechlor.
Once in a while the big snails knock it down and he harrasses them for the next hour.. ^_^
"Fish! Thank You! Oh, tropical huh? Did you buy a heater? Auuugh!"
Mega-pet stores prolly should not be allowed to sell animals as retail "items".