I got a piece from steve in the fall when he was doing his upgrade and it is now about half your size and I do not have the bright orange tips, they are orange but not bright.
I asked Tim (Aquavista) where I should place it awhile back and he said give it all the flow and light you can as he noticed thats when the brighter orange apperared on his.
I have to move mine yet so cant say if it helped mine or not yet.
If you move yours or you develop the bright tips, keep me posted on what you did.
Here is one that it should look like:
http://i39.tinypic.com/15fkgld.jpg