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Thanks for the replies :). I figured but hoped growing enough bacteria in the substrate might actually work :P   I don't know how to differentiate "survive" and "thrive" but I had a beta for 3 yrs at work in a 1 1/2 gallon tank and he is still alive (I moved so now a co-worker has him). But when...

Hi all, I'm betting the answer is 'no' but asking anyway :) Is it possible to cycle a tank that doesn't have a filter? I have a 2 gallon tank with 1 beta in it, 2 fake plants, and aquarium gravel. I don't have a tank filtration system for this little tank. Is it possible to "cycle" this way...