if you're just wanting to sterilize an empty tank, then bleach is perfect... use as much as you want, but all you really need to do is put some straight bleach in a spray bottle and all the inside until it's all dripping with bleach... let it soak for 10 minutes or so, fill it up the rest of the way with water, let it soak for another 20 minutes or so, then drain and rinse the thing REALLY well... then fill it with tap water and add 2-3x dechlorinator, let it sit yet again, then drain and rinse a final time. tank will be just as clean as the day you bought it. warm water is a good idea, but *hot* is definitely not such a great idea... I've done that with tanks before, and the sudden change in temp when draining it causes them to crack or break (lost 2 10 gallons that way... yeah, I made the same mistake at least twice... oops).
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