Green Slug/snail like hitchhiker?

[Blinkgyrl2987]

I bought some live aquacultured rock today. It had lots of pretty green plants on it. And I've had the rock in the tank for about 2 hours now. Suddenly I look at my tank and I see this big green blob stuck to the glass and moving! Its like a snail with out a shell... this isnt a nudibranch (sp?) is it?

Just wondering if this is something I should be worried about I hope it cant do any harm. If Anyone has something similar to this or knows what this is please write back! Thanks...

Megs~

[greenbean36191]

It sounds like a sacoglossan of some sort. There are a few thousand species though so without a pic it's hard to tell you which one. They're all herbivorous though.