Plan on getting a new pixie this week. Help please

[Lanky]

So i got eco earth and the a 40 gallon/30 gallon/55 gallon tanks that i can use for the frog. I plan on getting a lil guy or girl because it is a guessing what sex you get till they make a croak or don't but other then that and food what do you guys recommend to get and which tank would you recommend also note the 40 is terrarium that i used for a beardey in the past