After my Silver for five years knocked of the plexi glass tops and was found dead on the floor in September I have had a mostly 360 gallon South American Tank with out an Arowana. I saw a 12 inch black Arowana for sale in the valley and since they have not been available here in California for a while and when they are only for a small period (a couple months) I purchased one. The tank has floating plants (I perfer to give my Arowanas floating plants for many reasons) and water flows in the upper column of the water for the Arowanas to swim in. I think the Arowana is going to be happy. His tank mates include 16 inch African Tiger Fish, 16 inch Siamese Tiger Fish, 2 adult Oscars, 14 Red Hooks and Silver Dollars, 14 inch Marble, Giaraff and Shovelnose Cats, 2 Golden Dorado, and 1 Montegunses. The tank is somewhat crowded however not at the top water column. I'm still going to carefully monitor the Black Arowana to make certain the arowana intergates well into the tank.