I put most of the 2nd bag in and I'm only at 1-1/2 inches surprisingly. Me and my dad are going to Lowes to get two more bags of sand...Not a problem, two bags is enough. In my 40g I had about an inch of sand, this tank held my cories. I am a bit surprised that a 50 lb (25 kg up here) bag only made half an inch, but no matter. You could get another bag sometime to have spare, it can come in handy.
I have a lot more work ahead of me... My plants are coming tomorrow lol