I agree with Grins. I waited til I got MHs and you need to make sure your tank is mature enough for them. They are great additions, but you need to be patient until it the tank is ready to support them. And don't be tempted if you find a small crocea at your LFS - they may be small but they need stong lighting. Calcium, magnesium and alkalinity if they aren't balanced before the clam will be a struggle to keep up with once you get one.