Im build a 2x4 stand for a 125g tank and got it almost complete but Im wondering one thing. Here is how I got the stand so far- top and bottom are 73 1/2 long by 19 1/2 wide. The top has 3 cross beams and the bottom has 1. The legs are cut to 29 1/2 high (not installed yet). So here is what I was wondering- How many supports should I use on the front and the back and should they go from top to floor or just between the top and bottom rails?