i got one free that grew on my LR when i cured it. it doesnt need much light. right now(last 4 months) its been growing under 32w of flaurecent light. once a week it gets a small hit of my frozen meat stuff that i shoot at it. it also oves the pellets that flow to it. they are supper cheap to buy. the move alot mine moves from main light source to its feeding location every 3 days or so. kina cool to watch, but if you have any pepermint shrimp they will eat it