With the few I've kept they have been very accepting of tankmates of all varieties except for when something happens to trigger a response such as adding a new fish or what happened once where one of the silver shark shoal got spooked and in the resulting chaos of its throws they started to attack. Odoe can be boisterous so keep an eye on it. What I will say is personally I think your four Pleuros are big fish with a chunky female being a very hefty fish what does the aquarium look like currently?