What is this?

I've looked around some and couldn't find this. A couple pics in the threads didn't show for me so this may be a bit redundant. Anyway I still would like to know what this is and if it's good or bad. Thanks Adam
 
Uh oh... I don't know how to shrink the size of a picture file. Maybe someone could help me out with that first :roll:
 
Generally considered bad, yes... Killing it is what I'd do, but be careful... If you just pull it out it can regrow, and any little bits that break off and float around can regrow... Do some searching on Google, here and ReefCentral and you'll see 100's of ways of controlling Aiptasia... Personally, I used pure lemon juice in a hypodermic needle and injected them with it, and also got some Peppermint shrimp to eat the smaller ones, but that's only one of many ways of controlling them...

Also, if you've got one, there's a good chance there are others you haven't found yet...

Not trying to freak you out or anything, some people actually don't mind them, but in my experience they tend to spread quite readily, so I'm pretty quick on the trigger to eradicate 'em when I see 'em...
 
What's bad about these just that they spread so readily or are there other bad aspects? I'll probably grab a pepermint shrimp to take care of them. I've only seen one anemone will one shrimp take care of it?
 
They spread a lot, and they can sting and harm other corals/fish/etc... And, a matter of taste, but a tank full of 'em can be a bit of an eyesore...

The peppermint shrimp generally don't go for the bigger ones, they just help getting the smaller ones...

I.E. If you were to add some peppermint shrimp (Make sure you're getting Peppermint shrimp, and NOT Camel Shrimp, they look very similiar) there's a good chance they'd never touch the bigger one in the picture, but would just help keep it from spreading...
 
If you only have a few or one on one rock, erradicate it now. You don't want to fight lots of them.
 
I have a saltwater beta. They eat the peppermint shrimp? I'd prefer to use shrimp, but don't want them to be sacrificial.
 
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