i have only seen them at Wal- Mart. i think they r made by terta but i'm not sure. there are lights w/ suction cups on them and u put them in ur tank. does anyone else use these? i bought some i have one blue lite and 2 green. they r the coolest thing. i put the green ones on the bubbles and the blue ones on a cave i have. i will get pics soon. its says they r safe for fish but i am not sure if they really are? thnx