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That’s steep, are your corals dying? If not I’d re-check your test kits
You’ll need to add small amounts daily to bump it back up. All at once will shock the livestock
The sodium bicarbonate should be all you need to add to bump up the Alk. What number are you shooting for?
You can also change salt mixes to keep that magic number higher
Remove the aerator on your faucet and screw in your intake line for your RO. Run the waste line down your drain
You can add it directly to your tank and add salt to it. Normally its around 1/2 cup salt per gallon of fresh water
they have buddy units you can look into https://www.marinedepot.com/Aquatic_Life_Twist_In_100_GPD_4_Stage_RO_DI_System_RO_DI_System-AquaticLife-AK01371-FIRORD-vi.html?gclid=CjwKCAjw3cPYBRB7EiwAsrc-uVvDqVgPMJ8MaD0Dtf8X3qV98OCH6R_rHE02vvzHIA2_sjdnKC4T5RoCB94QAvD_BwE
I'm not sure, I don't go there that often but I do know they are pricey.
you should be shooting for "0" TDS using a RO unit. Using Tap+Prime Im not sure as I have never used the stuff. I would Imagine that anything above 1TDS may be pushing it