I am building a two shelf stand to hold two fish tanks, 75 Gallon on the lower shelf and 40 Gallon on the top shelf, This will be about 24" X 6" and about 44" tall. I need the lower shelf to support up to 700 lbs and the top shelf to support 350 lbs. I was going to use square tubing but I need about 60 ft and angle iron is about 1/2 the price. Was trying to find a calculator for load/span/size but had no luck so far.

I was thinking 1 1/4 or 1 1/2 angle 1/8 or 3/16 I would like the top to span the 5 1/2 or 6 feet, the lower shelf I could put extra feet on to lessen the load.

What are your thoughts on size and thickness for this project?
Thanks for the help. Mark Fish Room Plan0001.jpg