Why too small for Crappie? Do you think they'll take over and become overcrowded?
YES, most biologists agree any lakes under 40 acres, some say even 200 and I think 1000 is probably best to leave crappies out of. WHY? Because crappies are a boom, bust spawner which spawns earlier than bass. Their YOY outcompete and eat YOY bass. They grow too fast in the beginning for bass to control and end up stock piling in the 6" range stunting badly.
Unless you want to intensively manage for crappies or end up with paper thin 6" crappies.