07-01-2009, 11:16 AM
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i tried that air pump solution once for multiple betta tanks. It works well at first but eventually, at least for me, the air would favor one side because of water level or clogging or whatever factors and i ended up spending lots of time trying to balance the air flow so that each of the 3 tanks got the right amount of bubbles to push water. It works but it can be a pain. But Tyyrlym is right about cross contamination, one tank will hurt all tanks. However, you could add a UV sterilizer to the main filter to reduce the chances of spreading infections. Also a quarentine tank should probably be set up with a seperate filter for cases where one fish gets sick and you want to avoid getting the entire system sick.