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We just bleached a 450 gallon holding system consisting of 18 tanks and a big sump. Used about 1 cup of bleach for the whole thing, ran it for a day, drained it, refilled it with tap water, used Prime to dechlorinate it, ran it for another day, drained it again (including shop-vac out the water from each tank and the sump so they were basically dry) and refilled it with DI, salt and cycled it again. We did not bleach the bio media - we were converting it from a freshwater system.
I'd say just a small amount of bleach should more than suffice.
Why are you bleaching it? Did you have disease in it? I'd think stripping it and letting it all air dry for a few days before refilling it would kill off any remaining microbes before refilling the system - bleach is handy but you really have to be careful to dechlorinate thoroughly before you put living things back in - and cycle the system first.
Jenn
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LFS Owner: Imagine Ocean

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