What is this???

[Loraloo]

I'm trying to identify a little thing that popped up on my liverock a few days after I put it in. Any ideas?

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[xiaan]

Looks like Neomeris
Check out http://www.wetwebmedia.com/trialalgaeid.htm

[groan]

it also means you have a healthy tank. I had a bunch of them, i think they got eaten,

[KLKelly]

I had like five of them in the beginning.  I just loved them all neon green and bright.  They grew to about an inch long and I think the hermits started at them - they started being eroded at the base.