Sure, it's Nembrotha chamberlaini. http://www.seaslugforum.net/nembcham.htm Members of the genus Nembrotha are specialized feeders on tunicates. I hope you didn't buy it unless you're prepared to keep buying tunicates for its food.
It's eating algae? Nembrotha feed by placing the mouth over one of a tunicate's 2 openings then everting the oral tube into the tunicate. See http://www.seaslugforum.net/message/15797 for some great pictures of one feeding. If yours is really eating algae that's a noteworthy bit of new information.
At any rate, this "guy" (all branchs are hermaphrodites so s/he would be more appropriate) is reef safe in terms of what it eats & wouldn't harm seahorses. Some branchs produce toxic chemicals that can nuke a tank if secreted or if the branch dies. Nembrothas aren't listed among the really toxic ones but I'm not sure how they rank. Does anyone know?
I think the most highly scenario is that the Nembrotha is starving & searching through the algae for something suitable to eat. If Travis actually sees them eating algae & can provide solid evidence (like a photo of the mouthparts extended & sucking in algae) I will immediately send it off to my nudibranch-expert friends. They would all be astounded!
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