Can someone tell me what this is?

[Megs0628]

I started out with one and now have 4 and they are huge any help would be appreciated

 

[Fish Brain]

Looks like a hairy mushroom. Not bad, but as you said, they can multiply and take over an area or a whole tank in some cases.

 

[adesimone1]

They can get very large too. I've seen them bigger then a saucer

 

[Megs0628]

These are between the size of an orange and a grapefruit have to take them out of nano soon

 

[shipwrecked]

Congrats, I hope all yr corals grow that well and fast..

 

[Xavier613]

lol if your ever up this way id trade ya for one

 

[Megs0628]

I do not go in cherry hill to much traffic but next time I am going to Mullica Hill (I have family there) will let you know and we can set something up

 

[bairdimusprime]

looks like a hairy shroom i had two which are now four and all four are the size of a small carpet anemone... when they're fully expanded they take up a quarter of the bottom of my tank

 

[r2reyzer]

Xavier, if you really want one of those hairy mushrooms, I'll trade you for one (for whatever). As everyone mentioned though, they get really big. I have a bunch of them.