very nice, limas are pretty peaceful, minimum 125 gallon lightning quick predators, the babies can be a little finicky, and difficult to keep healthy, but basically i would not reccommend tankmates for any limas under 6"
Minimum tank size, imo, would be between 125-180g, due to their variable growth. I have heard of some that never get much past 1', and others that get to over 2'.