Just sold off my arowana to convert my 5ft tank to Marine anglefish keeping. Basically, is a normal 12mm tank. With the help of my friend to drill a hole to make a sump tank.So far i have Resun 650 chiller and skimmer. i going for a sump tank ratherly 3 feet (still planning what size) cos i using ehiem 2060 previously for my arowana. Any Pros good or bad comments pls advised. thks in advance if i can't reply your.