So I been neglecting my tank due to life lol anyways so my No3 is at 20 n alk is 7.0 I don't even want to test phosphate. My tank is 50 gallons roughly including sump. I want to do a 15G water change. I could run to the water store that I've used before n get 15G of RO Alk water in 15 min. I do have a RODI but will take 5-6 hours to make 15G. Idk much about alk change but (my question is would a fast change in alk be bad for my tank?) should I do a smaller water change. Reason I ask I'm trying to do this ASAP because tomorrow I gotta hit the books hard N it will be one less thing to worry about. Saltmix I'm using is Red Sea coral pro
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