I have a 125 with 55g sump moving about 750gph right now soon to be upgraded to 1100. I currently have a 9'' TSN, 9'' Pbass, two 9'' oscars, one 8'' Jag( hes leaving soon) and two 4-5'' Tinfoil barbs. I really wanted a big arowana but not sure I'll be able to upgrade within the proper time frame for his growth rate. If I do get an Aro I will just have to have a backup plan either a stock tank or to get rid of him. So what else should I add? I plan on beefing up my filtration some also.