They look exactly like in the picture you've posted, and I've had them for 6 or 7 months! They started off confined to a tiny area completely surrounded by zoas. As far as marine tank algae goes, Mermaid Cups look the coolest to me! When they started to get unruly, I'd reach in and trim them back with the forceps. I figure a piece must have escaped my grasp, and landed on the rock near the bottom... Where it is growing like crazy! I've entertained the thought of trying another sea hare... Im also in the process of increasing my magnesium. I've read that algae hates high magnesium levels, and will recede before your corals feel the difference... Worth a try I figure!
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