I think so but others will say no. That is something you need to findout on your own with your setup and plant likes. I don't add anything till I see leaves discoloring. So every gallon I add to soil I want 1/3-3/4 to come back. But that's just me. I should add I'm in a CEG room so evaporation isn't there. Reason why I do what I do. Each location is different.