For some reason, blue Zoanthids are worth gold to some hobbyists. Perhaps they are rare to come by, or maybe it is because they are slow growers. A few blue zoanthid polyps have been sold on e-bay for more than five hundreds of dollars, repeatedly! Regardless, they are a beautiful addition if you are able to get some, but hopefully at are more realistic price. These are placed at the base of my tank rather than up high near the MH lighting. Look at the red ones behind them; nice contrast right?