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Hi there - generally speaking, setting up a tank that has been up and running should shorten your cycle time, but I wouldn't trust it without testing.

Go to a hardware store and buy 100% pure ammonia - with no surfactants. Then, pour just a tiny bit in. It's best to measure it, but a capful or two at a time is probably ok for a 75g. Let it mix for 20-30minutes then test ammonia. You want the ammonia level to be up around 3-4ppm. Then, let it go overnight and test it in 24hrs.

If the ammonia is gone, AND there are no nitrites then you're good to go. If it's not cycling the ammonia, OR if there are nitrites, then you're not good to go. It's really that simple.

If you kept the original filter media then your cycle time should be very short. New media, however, means you're basically setting up a new tank as not a whole lot of bacteria lives in the gravel. Of course it's better than nothing, but you're still going to cycle for a bit.

The absolute worst thing you can possibly do - and I mean don't do it - is add fish without making sure your filters are properly cycled. They will either die, or live miserably. Just don't do it. Resist the urge. It's not worth it.
 
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