I forgot there was another thing I wanted to comment on.

A 75 gallon tank is 4'x1.5'x1.5' LxWxH. So if yours is 3'x1.5'x1.5', that would be about 55 gallons, but it isn't the standard 55 gallon dimensions, which are 4'x1'x1.5'. The height doesn't really matter that much for a BP anyway, so talking about gallons isn't nearly as important as just the square footage of the floor space. Most people will say that much area is too big for a BP as young as yours, but others report success as long as they give adequate hides and don't leave too much open space. My little girl is about 3 months old, and is doing very nicely in a 20L, which is about 2.5'x1'. It did seem to overwhelm her at first and we had to use the crumpled newspaper trick to get her settled in and eating.