i've got a 180g and a 150g sump, 3 -2L milk jugs do nothing for me, maybe 1/2 degree if you look long enough. i used to do that on my 75g and 1 jug would pull down 2degrees for about 2 hours, can't remember what i had for lighting, but it wasn't much.
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If it was easy it wouldn't be any fun.
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