One of my favorites. Once past the juvie stage, they become more and more vegetarian, so plants are out, as adults mine could eat a large head of romaine lettuce every other day, with a cup of thawed peas every 3rd day. I found groups large swordtails or large mollies endemic to the waters the inhabit, were good tankmates as they appreciated the veggie scraps the pearsei would leave (ex Poecilia velifora, and latipinna, or Xiphophorus mayae).
At 3 years of age and 14", mine outgrew a 150 gal and were moved to a 300 gal stock tank.