if sand was good for them i'd say it's ok to use, but it's not.what matters is the experience foo, not how many years, snakes, or breeding projects. you could be keeping snakes for 20 years and i could be keeping snakes for only one year, that doesnt mean you know more than me (believe me i get that a lot).
Let me start out with this. Corns don't need any special lighting. You're sounding just like those idiots I see at petshops that only care about making a sale and looking smart, not actually knowing what's good or not.
and let me guess.....you think it's ok to house more than one snake to a cage too.....