Help with ID

Hi, I have discovered these in my tank and I was wondering what they could be. The pictures are of two different things, so please click both. Thanks !

 

Looks like Aiptasia. Luna

 

i agree with luna. you will want to get rid of them.

 

So both of them are aiptasia, just different kinds? Thanks for the quick reply !

 

there are a few diffent types.

 

I'm not sure sure that they're aiptasia. When the animal in the first picture "retreats", is there a stony looking base left? As for the second picture, I'm thinking those are hydroids.

 

i can not tell from the pics.. looks like aptasia as well to me.
The first one has a little more color/sheen.

 

I'm thinking that it could be a non-photosynthetic dendro which are often mistaken for aiptasia.

 

The first picture, if it does have a hard base its probably a brown cup coral, if its base isn't hard then it is probably an aiptasia. The second picture definitely looks like hydoid polyps to me, Look very similar to y upside down jellyfish polyps.

 

I agree here not to sure of the first pic is aiptasia but second deff is hydroids... Get rid of thoes fast cause they will grow fast and sting other corals..

Heres a link look for colonial hydroids almost last pic on the link

Link:http://www.lionfishlair.com/hitchhiker/hitchhiker.shtml


Good Luck..