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Could of been a few things but I don't think it was a slug (As there are so salt water slugs). It was probably a nudi, there feeding habits are not that well understood and some eat coral, would need a photo for a positive ID.
Levi

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If you have some time to kill you should be able to find it here: http://www.seaslugforum.net/

However the vast majority of nudibranches dont eat algae so I wouldnt even bother looking. Consider improving your water chemistry, letting your tank mature some more (if its relatively new?) or getting some snails instead.

if you were at pices then i know what you were looking at. I had one a while back and they only eat sponge. They are really neat but even wiay a big yellow sponge it was gone in a week or so.

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Politely tell your LFS that they shouldn't be importing species that have little chance of success in hobbyists tanks.
A lot of newbies would buy them simply because of their colouring.

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so nudi-branches are not reef safe? just curious

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Some nudibranchs are reef-safe, other are not. Most have very specialized diets that may be "impossible" to replicate in our closed systems. Some have toxins in their tissues that can damage your tank when(if) they die. Most nudibranchs aren't suitable for closed systems at all. Having said that, I've heard of and seen "Algae Eating Nudibranchs" as well as Lettuce Nudis which in this case were different looking specimens. Some people have success with Lettuce Nudis, but I don't know much about the ones I saw that were simply labelled "Algae Eating Nudibranchs" (and weren't Lettuce).

Either way, many snails eat diatoms. Try a couple Astraea snails. :)

P's really don't care what there customer's tell them about there stock. They think they know it all when it come's to all livestock & IMO they really don't. Any time I have stopped there to get bone's & goodies for my Huskies I take a look around & have never been asked if I could be helped with something or what have you. Not a fan of the customer service there.

nudi
 

http://i747.photobucket.com/albums/x...9/SANY0822.jpg

like this one

Isn't this one o those that if they die and you don't get them out right away it will bomb your whole system?

well it dissapeared and i never took anything out. everything was fine but there is always the chance it climbed out.

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It's a species of phyllidiella nudibranch. They are extremely toxic. And yes they can possibly nuke your tank.

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