I just put 2 teacup rays in a 35 gallon long with nothing else in the tank besides a few live plants. Ive gotten so many mixed reveiws of what size tank to put them in and frankly i dont have the room for a 125 gallon tank and really wanted stingrays. So I will keep you folks posted on how it turns out. So far in the first hour a fed them a little to calm them down after the traumatic experience they had (I got into a car accident on the way home with them) And they seem fine.