NO NO AND NO!
YOu need a larger tank, much larger, or get rid of the fish!
On 29 Jan 2007 10:52:00 -0800, "Pablo" wrote:

I have a small 1.6 gallon fish tank. I added a small gold fish and a
pleco. I think the tank is going through the set-up cycle (amonia
nitrite nitrate). I think the gold fish is passing out. Anyways, Is
it possible to have that small tank with no mechanical filter, just
the air stone and the undergravel filter?



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I forgot more about ponds and koi than I'll ever know!