You can usually buy frozen brine at any LFS just ask for it.....it usually comes in little cubes or a large frozen block....You just take a little, dissolve it in water, and put it in your tank.....my CBB goes crazy for the stuff.....
Marine Mash:
4 ounces of peeled shrimp (fresh, frozen, canned)
2 ounces of any mollusk (clams, mussels, oysters)
2 ounces of fresh or frozen sea weed/algae (or frozen or canned spinach)
1 packet of gelatin dissolve in 2 ounces of water
1 ounce of liquid multivitamin preparation
I kind of just used this as a guideline.....You take all these things and put them into a blender or food processor...Grind it pretty small if it is just for the CBB....If you have any larger fish that will also eat it then you can grind it into larger chunks.....Then freeze it into cubes or a big chunk whatever you want....