200 gallon fis tank question.........?

I have a 11" silver arowana, 6" albino oscar, 6" frontosa, and 4 parrots. they are in a 150 gal tall now. But I have a 200 gal long I will be setting up soon. (had to reinforce so floor). The 150 has 3x filtration needed but is not big enough due to the dimensions of the tank (tall). What other fish would work with the new setup? the new tank is 7' long. and the parrots probally wont be going. any input? thanks. would like a catfish or maybe a ray? datnoids? tinfoil barbs?