Worm? Sponge? I have no idea...

The two two long thread like creatures - what are they?

 

Sponge, with an infestation of flatworms.

 

Thanks! Yeah, the flatworms are a constant battle at the moment. Trying a six-line before chemical control.

 

Do I need to worry about them at all? There's another section underneath with about 30 of them. Couldn't get a good photo of it.

They're waving in the current.

 

The sponge no. The FW yes, you've got a case of the bad kind.

Try not feeding the 6-line for a day or two and then take a turkey baster and blow the worms of right in front of the six line that might encourage him.

Do you have many corals yet?

 

Yeah, a fair number. A few LPS (Hammer, Golden Torch, and Frogspawn), a few big colonies of zoanthids, toadstool, assorted mushrooms, and various softies.

 

Hmmmm, well if the Planaria start to cover coral tissue you'll want to get more aggressive.

 

what size tank? Six lines can be horrible. Halicoreses genus wrasse worked for me and they are much nicer.

 

Yellow corris wrasse is one of the best at keeping pest in check to, It's my personal favorite.