Outside :lol:
It may be a bit bigger, its 4foot long.
Made of some black plastic stuff :lol:
And if i do end up heating it im just going to keep some fish like Peppered corys and glowlight tetras or something else cheapish that likes a lowish ph , Just to see if they do reproduce, as it will be easier to do w/c and will have constant green water and mossie larvae