That look EXACTLY like the tank I have the feeders (rats) in...an mine is not a 75 gallon...I think its a 29 gallon breeder tank..not sure exactly. My 55 gallon looks way larger then that...how weird.
But yeah like the others said...make sure to read the care sheets on the site...they have alot of useful information by people who know what they are doing through years of trial and error...no one here has yet to let me down as far as advice as gone.
You need to work on the set up a bit...once you have it spot on as far as hides...temp....humidity etc. go you'll find she just might eat for ya each week.
It's very important to get the set up right on...and yeah humidity is something you need to keep an eye on...let us know how things go and ask away...we love questions...and dont be shy of the search feature either...I use that thing a million times a day myself :P
Any who pleasure to meet ya, cant wait to see more pictures :D