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Couple things:
1) Kind of curious why you'd bury the seed gravel. It seems like the seed gravel would better circulate by being directly in the path of of water flow than buried beneath it.
2) Why not take media from your established tank and stick it in the mini-filter or in the seed gravel media bag?
3) Flake food sort of works, but it breaks down unpredictably. Straight ammonia is more of a daily hassle, but the cycle will start and end much sooner.
4) Using old tank water really won't make a huge difference. The bulk of the bacteria you seek aren't hiding in the water, but on the media, gravel, and other surfaces.
5) The bacteria don't -need- heaters, but they -like- heaters. The bacteria are more active with heat than without, and will reproduce faster at higher temps, as long as you're not approaching their kill-temp. 74 should be plenty warm enough if that's the bare minimum, although a consistent 78-80 might be a few days faster.
Regardless of the points I just outlined, you'll cycle anyway, just might take a little longer.
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