bud8fan good move on the supports, all those holes the electricians cut to run there wiring remove strength from your joists.
everyone should stop the discussion, read the article that the link was to in the very beginning of this thread, come back to the table and then have an intelligent conversation about structural integrity. thats really all there is to it. if you put a 3 ton aquarium on a floor that you havent reinforced, or had atleast inspected by a professional then you really should have your head inspected. you may not have a problem now, or in the near future, but the damage you do to the floor doesnt just go away, it compounds over time, maybe the next owner sticks a piano there and has it fall on there head when there in the room below it and dies. all because you didnt research before you put your aquarium up.