Green gel like ball and other unknown

[Butterz]

This is my first salt water and it's been up and running for two months. I have 80lbs of rock in a 72 gallon bow front. Half the rock is from petsolutions about 2 months old, and the other half from an established tank that was downsized.

I've been noticing a lot of growth recently and have been identifying the ones I can with my books I have. But there's a few here and there that have me stumped.

One is this green ball, there's about 4 of them through out the tank. What are they? I have a few snails and 10 blue legged hermit crabs and that's all the live stock in the tank besides what's growing on the rock.

In this picture you see a feather duster and a green ball right above it. Then to the right of them is this collapsable thing that closes that black opening. It looks like a shriveled nut shell. But it'll close and collapse every once in a while then open back up.

 

[Tangweed]

That looks like bubble algae. Try to pull it off with out breaking it.

 

[Butterz]

Crazy.

When I was first curing my batch from petsolutions I had this clay colored bubble stuff that carpeted some areas of the rock. Nothing like this, and people said that was bubble algae. So I assumed that's what it looked like, being different colors of course. But this is like an emerald crystal ball. I'll try to pick it off, but it gets out of hand, I'll grab a sally lightfoot crab.

I believe I identified a coco worm today also!

 

[Tangweed]

I had few, you should be ok.

 

[crvz]

they're pretty easy to control, but it is a bubble algae. I don't think sally lightfoot crabs would help, but I have heard reports that emerald craps eat it.

 

[Phyxius]

Looks like bubble algae. Best way is to gently remove them or siphon them out at water changes. Try and not break them if possible as its been mentioned it will release spores that can cause more

Like crvz mentioned Emearld crabs sometimes eat it but its hit or miss. I don't think sally lightfoots will touch it though

 

[Butterz]

Okay thanks, because I've read somewhere that they did but I could have mistaken the kind of algae.

I had this macro algae before, I ended up sucking it out when I did my last water change a few days ago. Since this bubble alge so close to the feather duster and whatever that other thing is, I'll try to remove by hand first.