when i 1st started this hobby. i didnt know a thing about aros, but that was the 1st fish that ive liked, so i just went to a lfs one day and randomly bought one just because. threw it into a 10g with fresh new water and everything. upgraded to a bigger tank in 3 months thinking the aro would outgrow the 10g pretty soon. just depends on how motivated a person is on keeping the fish. if doesnt care... that aro will be stuck in the 125 until the day it dies... or the owner would really save money and be serious about getting a bigger tank.
But if the room in question is on the 2nd floor you may very well need to install supporting beams/joist under the spot where the tank will be placed. Another thing to consider, whether its possible/feasible and most importantly what room is below your bedroom.