09-03-2008, 05:48 PM
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Fishless Tank Cycling
100g is a great size tank. If you want to cycle your tank without causing any fish any harm it can be done. I just cycled our 210g. I used 100% clear ammonia (doesn't fizz when you shake the bottle), no fragrances, got ours at a hardware store. I put in 3-5 drops (eye dropper) per 10 gallons. I also asked the LFS if I could have a few cups of their gravel from a healthy tank, and also their dirty filter cartridge. They gladly gave these to me.
There are a ton of websites that can give you more specifics. The goal is to attain a reading of ammonia 0, nitrites 0, and a nitrate reading. It took a couple of weeks to do.