oh no problem mate.. always glad to help.. for a 6X2X2 i'd really say stick with one aro.. i know you'd want to add two more but the fish wouldnt really be happy.. it took me two years to get the 2400 gallon project movin.. one year of dreaming.. one year saving and the building part, it has just come through pretty quick.. what size is the aro you have now? one option is to buy three or four 6" aros and sell them when they get a little too crowded.. but again the catch is selling a large arowana is always a problem.. i think you can get jus about any fish you want these days.. but at a price.. arapaima.. rays..tsn.. rtc.. almost anythin is available..