my live rock needs a makeover

[MFish]

Well you will need calcium and alkalinity...

And yes, those are the easiest to keep.

Dusters are filterfeeders, i think the shrooms will eat that bottled phytoplankton stuff, but you need to check on that.

 

[Satchmo]

Calcium shouldn't be much of an issue with any of those animals. Just keep up on your regular water changes. You won't need any additional supplementation. Although I wouldn't add any inverts unless you get that trigger out of there first. You never mentioned how much lighting you have. A 125g is a deep tank for normal florescents. It won't matter for sponges or dusters, but the shrooms are photosynthetic. You may have to tinker with their placement until they're happy.

 

[1BadHawk]

How about some msuhrooms? theres a good variety of types, and colors that could ad a little extra. They dont need much light and are basicaly maintenance free.