The Silly Things Bristle Stars Do

For a while now I've seen where folks will exclaim that, during feeding, their stars will "reach out and catch" things as they drift by.  I always thought that was a little over-stated.

Two things have happened to start to sway my opinion:

I did a little "light" reading on Brittle Stars (how they aren't really starfish, their digestive system, nervous system, skeletal system, etc).  I learned the nerves in their legs are sensitive enough to detect light (which is how they know when it's dark even though they have no eyes), and that those nerves are also sensitive enough to be able to detect smell.

Over the past week or so, I've noticed that during feeding time (at least with mysis cubes) the Brittle Star, which generally has a few ends of his legs out on the substrate, will begin to sweep the substrate looking for food.  Today there was nothing of the Brittle Star exposed... until the cube hit the water.  Two or three legs came out from his hole almost immediately.  They were dancing around like a couple of Keystone Cops trying to get out of each others way.

Those legs didn't have too much luck with catching mysis... I noticed one, maybe two shrimp that the Brittle had caught.  It wasn't until I noticed the mysis starting to settle upon a rock positioned above his hole that I became a believer.  A leg pops out of a nearby hole, grabs the mysis directly, and disappeared back from where it came from.

I'm thinking that specific leg detected the odor of the mysis and went straight for it.  It's not quite like plucking food out of the water column that is drifting by, but almost.

So I think I'm more open toward comments as such.

It's also been a while since I've posted some pics.  Here's how things are going now:

Notice the tank has a mostly-green color.  That's the prevalent color of the species of coraline algae that is proliferating.

Looking closer at the coraline, it's still mostly green with some hints of purple at the top right and bottom left.  The bottom right rock seems to be encrusting with a grey coraline.  Hair algae can also be seen bottom left, as well as the last remnants of cyanobacteria.  The center rock, at it's bottom, shows the white color those rocks used to be.  And the mushrooms seems to be very happy.  The specs on the back of the glass are "chaeto critters", some sort of "pods".  They are everywhere.

Here you can see more purple and green coraline algae.  The anemone bowl is also starting to take some coraline.  The longer white specs on the bowl are some sort of tube worm.  The smaller specs are just substrate.  To the left, the chaeto can be seen.  It's about twice to three times as big as when I got it.  Not a good sign for my water, but at least I'm combating the nitrates and phosphates in some fashion.  Hopefully a RO/DI system is in my future.

I have a sponge and some sort of white feathery things on the vertical rock bottom right.  The Star Polyps (center) are still doing great, as is the Anthelia (top left).  The rocks to the left are still brown.  The purple coraline seem to prefer these rocks more than the green.