Hi DE
yes, we already try our best to add fan, small exhaust fan etc.. and open the cabinet door on the chiller compartment 24/7. For the MH portion, i am really at a loss on how to do it now.
Our tank is 4ft X 2.5ft width and 2ft height.
Technically, in terms of water volume, 1/4 arctica should be fine... well, technically..