I know I just posted but thought these ideas/questions needed 2 different topics. If this is a bad idea, I'll combine them.
Anyways,
I have a system consisting of 6 fishtanks (1.2m x 0.4m x 0.45m). They are set up as 2 columns of 3 (2 across, 3 down). The one tank is the filter tank. It is...