Hey Too - Well the stock light will keep them alive - but it certainly lacks on the blue department. The lighting is rated at 6500 or 6700K. It works but you'll lose color. I tested out some yellow zoas - here's a pic of the two shades. The darker brown ones you see were the only polyps to pop out, hence the color. I took the LED off because I needed some room for ricordea (using dual T5 with ATI Aquablue and blue plus on a 24" fixture). Ill post pics tomorrow - batteries just died taking pics of the zoa! Suffice to say - macro is doing great, coral is living, but brown as it tries to make more zooanxthae (spelling) to cope with light. Needs more blue.