Its an 18x18x48, I really dont have the funds to go larger, I looked everywhere for a used one I can afford, this was the largest. I read on a couple DIY projects, but I can imagine myself swimming in my living room if I did it... I'm saving up for a bigger so hopefully I can upgrade his home soon. Question for the arowana experts, I have been feeding him Tetra Jumbo Shrimp Freeze Dried Krill Fish Food this whole time, giving him a guppy or molly as a treat once every 1 or 2 weeks. He won't take pellets, no matter what kind, I have tried EVERY brand. Do I need to change his diet at all?