Just received my 1500 ml bag! Unfortunately I am leaving town for work and will be gone for about 2 weeks. Fortunately this sounds like a perfect opportunity to take before and after pics as well as document any changes in parameter. Lately my tank has been staying super stable Alk 8.5, Cal 440, PH 8.3, Phos .02 and Nitrate around 10. I don’t have an apex so It will be interesting to see if alk and cal are lower when I get back. My wife will stick to the fish feeding schedule and make sure the ATO is filled so In theory if anything changes it will be due to the evo gel. I am taking it slow and starting with just 3ml dosed once a day at 3am even though my system could handle 4ml I figure it’s best to under dose while I’m gone. LET THE GAMES BEGIN!