I've kept a similar red eye species before the C. Irrubesco, and had 3 in a heavily planted tank which worked for a little while... but at the end of the day, 1 of them became extremely territorial so i decided to sell it... then the other 2 lived okay with each other for a few months till my heater busted and i sold the remaining 2 (since i was planning on tearing down the tank)...
Now as for the Carinotetraodon borneensis, i've heard they are even more aggressive than the ones i previously kept, so not sure how well they would work in a community tank, especially mixed with other fish...
Maybe some one else who has kept them might chime in, but i think mixing any puffers together or with other fish will always be a risk...