i already have the aro , he is in my 38 gallon he is small only 9 inches so i will grow him out in the 135g and i am looking for a 240g or 300g prob in a year or so .
the one thing i mainly hate about oscars, messy as freakin crapppp...... if you wanna keep your aro in there, i'd lower all those plants and driftwood. aro's love free swimming space. and with an already small tank, i'd be tryin to give him undistirbed swimming space.