They don't eat plants, you need to primarily feed bloodworms but they are messy eaters and will overeat to the point they die so you need to be careful not to overfeed. Because they are so messy you need to do a 50% pwc at least once a week to keep it clean. I personally have a ten gallon with 3 in it but I wouldn't do much more than that they are very territorial once they reach sexual maturity. Also you need a lot of stuff in there to keep them occupied i.e. bubbles, plants, caves. They like to make caves there only little homes. Any other questions I'll be happy to share what I can.