That's a good start. Keep in mind, my 90g system is about 3x the volume of yours (although I have a TON of rock, a 20g fuge & 20g sump, about 1/3 full, so I guess a very rough estimate of 90-100g of water...) & I'm dosing 2000mg, 2x/day. So you'll want to work your way up to around 500-600mg 2x/day.
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