i want to get more fish in my tank, was thinking about a motoro ray. i have 1 7" inch florida gar, 1 7-8" silver aro, 1 3", 5", 8" inches bichirs, 1 4-5" inch flagtail, and 1 8-9" inch lima shovelnose catfish. i wanna get about a 4-5" inch ray, could i keep him in my 240 gallon 8'x2'x2' tank for a long time? how fast will he grow and would he become agressive to my bichirs or fish later?