Thanks for the advice! I'll monitor from time to time. Currently, the two of them seem alright in their enclosures.I'm no expert on communal's, but keeping only two of them together sounds like a very bad idea since I can't foresee a way to prevent them from establishing their own territory.
I would highly recommend you keep them in different enclosures.
If you really want a communal set up then get a group of Monocentropus balfouri instead.
Thank you! It was a good read and definitely learned something.I have no experience, but have been thinking I want a communal set up myself. The following from a few years back make for interesting reading & the main poster kept P regalis.