the big issue is the 75 g tank... there is a good chance the snake may not even eat until you get a more suitable enclosure. as advised above you should try to buy one off of craigslist... there are ads on there that sometimes sell the tanks 10 bucks per 10 gallons.

make sure you arent using half logs as hides and just let the little one settle in before handling it... (though i should probably heed my own advice about the handling im a sucker for new animals)

that being said... my pastel male still strikes at the glass when i walk by his tank... ive had him for over a year now. if im holding him... he tries his damnest to do as much damage to me as his little mouth can... hes just plain sinister lol...