Dry bulk powder chemicals will be Cheepest
Check out caco3reef.com he has bulk chems for sale I use his calcium
I use baked baking soda for alk. And have lots of mag left over from an old sponsor on the forum who no longer sells products.
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250G DD LED SPS R.I.P.
180G LED SPS
80"x36". 300G custom build
Owner of Mountain Ridge Heating and Gas
Class A gas fitter, HVAC
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