Coral Eating slug

Grace74

New member
Hi All, I have an established 300 litre tank which contains lots of live rock, 3 leathers and a scattering of different mushroom corals as well as a clown fish and 2 blue damsels (and some cleanup crew obviously).

2 days ago I noticed that I had some large white slugs crawling round the glass of my tank, having looked them up I think they are Tritoniopsis based from what I have seen online as they look the same but they don't seem to have eaten anything?

They would have to have been in the tank for at least 18 months because that's a last time I put anything in and they are about 2 inches long. I have checked all my corals and there are none missing, some of the leathers detach and drift around upon occasion but I've had a look and I can still see most of them.

Surely if they were coral eaters and this size they would have caused some devastation in my tank by now as I don't have many corals? one has crawled back into the rock but the other one is still mooching round the glass. Are there any slugs that look the same but which don't eat corals?
 
Are there any slugs that look the same but which don't eat corals?

I can think of a few but it will be so much easier if you can just take a few photos? The closest, in terms of appearance, is a number of Dendronotus sp. (Dendronotus dalli, for example). Although they won't touch any corals, they aren't common and are mostly found in cold water.
 
That one is a Tritoniopsis elegans and is in fact a coral eater. What corals do you have in your tank?
 
Just leathers and some mushrooms which I thought were it's food of choice. I've removed the critters as a precaution as I'm sure they were just waiting to eat them even though they hadn't already.
 
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