Scyphozoan Polyps. Are they a problem?

[menace78]

I just noticed 2 hydroids in my tank today and found pictures of them on the net, but for the life of me I can't figure out if there a problem?
One of them is a Scyphozoan, but i can't seem to find anything on the other.
There is hundreds of them all over the upper 3/4 of my tank on the rock.
I attatched the 2 pictures I foundThe 1st one is the unknown the second one's the Scyphozoan.

I know they become a jellyfish, but are they bad?
If so what do i do to get rid of them?

 

[buffalo]

Rid yourself of them now if you can they become a pest and can multiply very fast. Don't wait.

 

[menace78]

Rid yourself of them now if you can they become a pest and can multiply very fast. Don't wait.

Any clue on the best way to get rid of them?
I'm not going to scrub the rocks and I don't like chemicals.
Is there anything that eats them?

 

[buffalo]

I've been doing a search and most suggest scrubbing them off , smothering them with kalk taste. When it comes to something eating them i read one instance of a copperband eating them but the person wrote he never so him eating them but they all disappeared after a while so he figure it was the copperband.
Some also said pick them off with tweezers.
Control them now before they are not of control

 

[morgan]

so what do they do to ur tank do they become free living or do they sting corals??

 

[menace78]

so what do they do to ur tank do they become free living or do they sting corals??

From what I have read, They are moon jellyfish and I don't think I'll worry about them..
Saw one detached from the rock and attached to the tank glass as a tiny jellyfish, then one of my snails came by and ate it

As for picking them off with tweezers. to the naked eye there only a speck of white dust.. lol
Now that I have watched them for a few days.. seems like the snails keep grazing them off the rocks and they keep coming back later.

I'll just let them be for now and post anything that I see about them if they do anything ells..

ty for the replies.
Casey