I started dosing Seachem Excel. The directions state: "On initial use or after a major (>40%) water change, use 1 capful (10ml) for every 20 gallons. Thereafter use 1 capful for every 100 gallons daily or every other day. Dosing may be slowly increased in high-growth aquariums." 55g My 1st dose was WED 3/7 @25ml 2nd dose was THUR 3/8 @5ml Skipped FRI 3/9 3rd dose SAT 3/10 @5ml Today I registered for the forum at Seachem. My question will be, "What is considered a high-growth aquarium?". Ps. I accidently bought 2, 2l bottles so will use every other day in combination w/ 2l of DIY CO2.