The aro's been really skittish lately. I have about 1/3 of the tank covered with a blanket (8x2x2) so he can hide if he wants, but lately he hasn't been coming out at all. He'll peek past the blanket and then turn around and hide. At night I have a moon light on and if I sit in the dark he'll come out and swim to the other end of the tank, until he realizes I'm there to which he'll quickly swim back behind the blanket. The water should be good. Did a lot of water changes last week to make the water near perfect, and now only the filter needs to be cleaned(barely flowing now
). I have a 55g sump I'll be hooking up in a week or two but I don't understand why he's being like this! I've had him for a good 4-5 years. Also decided to buy some krill(the aro, clown knife, shovel nose cat, etc. are all feed arowana sticks), and no one would come out to eat the krill! Even tied a krill to a fishing line and suspended it near the surface for the aro and he just swam past it... Kinda just frustrated with him. Saw a jardini in the LFS today for $100 (waaaay expensive) and thought about maybe ordering one and raising it to be more personable. Any ideas on what to do with my aro? 
nice job on reading his post.