my turn on WTF is this.

[Bigevul]

Looks like a tube sponge of sorts? Nothing living inside....

[noirsphynx]

Yup sponge

[Craigdillman]

sponge they love Kenyan tree coral for some reason , harmless

[asylumdown]

I couldn't say for sure, but I bet it's probably because the coral is non-toxic to the sponge and it will inflate during the day, blocking most of the light (which those sponges seem to hate), but deflate during the night exposing the sponge to good water flow.

[Leah]

So I guess it's not seamonster fingers

[asylumdown]

Originally Posted by Leah

So I guess it's not seamonster fingers

It's probably sea monster fingers.

[Craigdillman]

Originally Posted by asylumdown

It's probably sea monster fingers.

Sorry correction, after closer investigation most likely sea monster fingers

[Craigdillman]

Check your tank for the sea monster and if its missing fingers... boom scooby doo style solved

[Craigdillman]

Sorry I've had a lot of coffee and not a lot of sleep