now, this tank is 8x8 ft round. 30 inches high. Ive filled it 3/4 of the way up which is PLENTY of water for the stingrays and the arowana. Matter of fact it might still be considered understock. I have two large pond filtrations which does a very good job of keeping the water crystal clear. These arowanas are tank raised from 8 inches and hand fed. They have never jumped or attempted to jump out of this pond since I have had them. They seem to be a couple since they do swim together a whole lot and swim circles. I do not know for sure but that would be my best guess. Iv raised aros for almost 5 years from silvers to jardini's. I am no amatuer with stingrays either going on 4yrs with them. To that person who is giving me advice on how to keep fish, please get more details before you do so.