which one should a nooby use

[shaddj]

hey guys

a new guy here and need some advice. i'm looking to set up a terrarium for orchids and i have a few options.

ive got your standard 50 gallon aquarium that i can stand
upright. or i have a 100 g cube aquarium (30" cubed). my last option is a outdoor "tool shed" that is attatched to the garage. it is a fully enclosed room that has a 4'x5' window on one side. id say it is probably 3'x 5' x 8'tall with a full door on one side for access. the only problem i see with the room beside the additional cost to set up is the sand floor in half of it.

again im new to orchids and really new to terrariums and dont want to set upsomething that is too much.

any advice, suggestions? let me know what you think.

thank you
shaddj