What is everyone's opinion on an Arowana in a 180g? I have 2 Oscars in the 180 with 6 silver dollars, and I eventually want an Arowana to grow out in another tank to put in the 180g. I understand I will have to upgrade to a 250-300 gallon in the future, but do you think an Arowana could go well in my 180g for a few years?