Can you ID this mushroom?

[kdrafahl]

I have another mushroom I found in my tank that I don't remember buying. Someone may have given it to me at one point and it got lost for awhile but recently resurfaced. Just curious if it's anything unique or special. It's awfully neon green.

 

[kdrafahl]

And by "œawfully neon green" I don't mean it looks awful, it's really bright and nice looking.

 

[eastlake]

looks kind of like a st. thomas mushroom but I could be way off