is this the one u talking about?i look at a steel frame 650gal. tank with viewing windows every day...I used mild grade steel with an epoxy emamel paint to protect the metal. Its been running two years and not any sign of rust. Theres pics in my personal gallery. My tank is lined with polypropelene, 45 mil epdm liner and uses a 3/4" acrylic for a 30" height. I dito that comment on a complety stainless aro tank. Its somewhere one here i had pics of it 2 yrs. ago.