What are these?

How do I get rid of these spreading little things?

 

Aptasia. Use Aptasia X or Joes Juice. You could try to remove the rock but you risk the chance of spreading them.

 

They're aiptasia, and a big pain in the butt. I've heard lemon juice or boiling water will kill them or you could use aiptasia x. I think you also have to take the remains out or each little piece becomes a new one... what I've been told anyway. Someone else will have to confirm/deny that part. Good luck!

 

For an infestation like that I would say peppermint shrimp or Berghia nudibranch.

I just think kalk paste, joes juice boiling water would be a lesson in frustration.

Of course if you can remove the rock they are on and they are isolated you may want to try that.

Good luck

 

Peppermint shrimp work...need like 4 of them
They will however not eat everyone; they leave a couple to "farm" so they have a constant supply....they also get lazy if they overeat your fish food
They hide all day and come out at night except if your feeding then they pop out for a second

 

+ 1 for the combo suggestion. Used that to eradicate a huge population of aptasia in the past.

 

If you have no luck removing them, Sneak one or two into your friends tank and observe how he gets rid of them, then do just what he did... : ]

 

sounds good to me! Thanks guys.