There was another topic about this somewhere else maybe a month ago. I've never personally had one, but my work has had do many I feel like I have.
Basically they're nonphotosythetic. This means your light is no good for it. It NEEDS to be fed phyto and/or zooplankton at least once a day. They are also very picky about their placement especially with flow. Make sure if you're seriously considering one, the one you get is open at the store a fair bit of time. Some do wonderfully and others do not.