first of they are brackish water and will require salt water when adults.They accept canivoruos diets(like shrimp,feeders and ect) they also need at least 75 gallon imo.
they et almost 2 feet i bealieve. i had a pair that grew 5 inches in 6 months and i had to give them to my cousins 300 salt.they are really cool....but they are not freshwater.