Hi JC,
If you are feeding microworms on buffering substrates I would suggest using a petridish and pipetting the microworms in there.
I currently have my spawning group of C.panda, breeding pair of barbatus, yet to breed group of C.schutlzei Black and yet to breed group of C.cervinus in with shrimp. Having shrimp there have not distrupted spawning of the corys that have spawned.
I am thinking about introducing some shrimp into the tank of C.septentrionalis Colombia group as they are very skittish and I was suggested to use dither fish in with them. So I am going to use dither shrimp ?
Most of my tanks are sand, half sand half bare or bare bottom tanks.
I have bags of shrimp substrate but they are still sealed under one of the racks! lol