1) Double the amount of Live rock you currently have. Look for large, porous - looking pieces with good algal and sponge growth on it. Finding established Live rock on the Message Board is a good way to get some well - established rock for cheap

 

2) Remove the Yellow Coris for sure, and probably the Yellow Tang as well

 

3) Feed the next CBB worms as well as brine and Mysis; bloodworms, glass worms and live tubifex and I'd try those 'probiotic' live blackworms that Benepets carries

 

 

 

 

 

You don't have enough live rock. Not sure where you got the "100 lbs" figure from, let me explain...

 

 

This is MY 90 gallon reef tank. So, same size tank. My tank has 75 lbs of Live Rock in it:

 

 

 

I think you will agree that my 75 lbs sure looks like substantially more rock than your 100 lbs...

 

 

A CBB needs an environment with a lot of Live Rock to forage in. These fish use their long noses to pull worms, amphipods and other small creatures out of the rock.

 

I also don't know if your rock is 'old' enough for a CBB yet. Does your rock look like this, close up?

 

 

 

 

Lots of little nooks and crannies; filled with little holes and algae spots, sponge growth, etc...

This is the proper environment on which to provide adequate worm and amphipod populations on which the CBB can feed. My tank has been up for 15 months; however, some of this rock is significantly older than that, as it came from my previous setup which ran for 3 years...

 

And, even though I have what appears to be a good environment for a Copperband, I don't have one.

 

That's because of the 3rd thing you need to have in order to successfully keep this fish: the right tankmates

 

I have several other fish (wrasses) who keep the pod and worm population too low to sustain a CBB.

 

In your case, the Yellow Coris and (to a lesser extent) the Yellow Tang are not compatible with the CBB. The Coris will eat up pods and worms needed for the Copperband; the Tang will clean out many of the algae-laden worm breeding holes and thus limit food availability for the CBB in that way.

 

 

A few cloning RBTA's I see.

Aloha  

This is just under the water surface in a small (~3'x3') Hawaii tide pool where their preferred food flourished because it was a Refugium where Butterflyfish and Moorish Idols (and Tangs) could not reach.

This very healthy CBB lived for years in a WMAS hobbyists tank where the sand (last pic) had 1000's of reproducing tube worms. 

In the original pic it was hard to see, but a picture editing program sharpened the image so the tiny black tubes can be seen sticking out of the sand. 

 

Given that this type of fish (CBB) is notorious for being difficult to keep - mainly related to feeding  / starvation issues...

 

 

1) How large is your tank? How many lbs of Live rock? How long has the tank been running?

 

2) Any other grazers or 'worm / pod feeders' in the tank; e.g. wrasses, mandarins, blennies, sailfin tangs, etc?

 

3) A photo of your tank may be helpful to assess whether or not you have the proper environment for this species

 

4) Bloodworms, tubifex, glassworms... ever try feeding it any of those foods?