Quote Originally Posted by don-n-sa
I think you would be fine for a tank up to around 500g...but you should be venting into a large space where your ac will pick up the humidity.

The very large tanks need to be ventilated properly or you can ruin your whole house...do a search on RC for MR. 4000. He destroyed his home with his tank and is currently out of the hobby but still active on RC for advice.
i can't imagine talking to the insurance adjuster on that deal. :sick