Hey. I have had a Jardini arowana and a motoro stingray in a 330 gallon tank. I do a WC every week 50 percent and i want to put some discus in there but i'm a bit afraid of how the Jardini would react to them. The Jardini is about 6 in along with the motoro and the discus i'm planning is about 2 or 3 inches. Is this okay? I originally bought my Jardini in a 100 gallon tank with a bunch of discus about the same sizes. I'm planning to get 3 discus all together all about the same size. The Jardini's mouth size is about half an in? 1 in? Stingray i know will have no trouble. The Jardini also seems pretty tame, he is always scared whenever anyone walks buy but he sometimes tries to bite the stingray. He used to do it a lot but now he just sort of stops and leaves the stingray be. Any suggestions?