What is this critter?

[havnfun328]

Any idea what this is? It's about 1/2 inch long, and hangs out on the back of the tank. It moves up and down a few inches, up to the top and back down to where it is now. Seems like it's eating algae, but I can't tell for sure.

Thanks.

 

[webcricket]

It looks like a limpet. I have them in one of my freshwater tanks, and I do believe there is a marine version of them also.

 

[Victorio]

It looks like somesort of a childs booger, try not to wipe it off as it will smudge on the glass, its best to leave on there.
xxx

 

[havnfun328]

It looks like a limpet.

It's not anything to worry about (like aptasia)?

 

[blackwolfXKAV]

my guess is that it may be either an albalone or a limpet.

both should normally be fine in an aquarium, but I would watch it just in case.

 

[webcricket]

In SW tanks, I believe they are only a worry if you have SPS corals as they will feed on the tissues of those corals.

 

[Max]

It is a limpet and very few of them are harmfull to anything but algae. They are in fact one of the better algae eaters they are very hardy . I'd just keep an eye on it.
hth
Max