Put the whole setup on a plywood sheet and that would help. Also, it might be better if you put your bed right up next to a corner wall in your room. You would have to give up one one of your 55 gal tanks though, but with the money you save, you could fix up your other 55 and your 30 better. The corner wall is the strongest part of the floor. The middle of the room away from all the walls is the weakest.