i dont know if they hurt plants.....
Hoenycomb is semi-agressive, he flares alot, but never really goes after anything. Kinda full of bark and no bite :D
I will see how he does, he has been in that tank for 2 years, so to reduce territory issues, i will cup him before i add the cories.
I am getting sand today, and switching the gravel out, so i want to wait until my tank is stabilized again to add the cories. My tank is cycled, but i might go through a mini cycle by changing substrates.