Grab some FloraKleen so you can flush out and start with what they said above anywhere from 1/4 to half of what is recommended, you can build tolerance by topping off your resevoir with a concentrated amount once a day until eventually you build up to what your plants need. The guidelines on the bottle are just that, guidelines each strain responds differently to dosage. If you ever run into a lockout from low or too high you can use botonicare clearex and it will correct the problem from lockout. Are you using a TDS meter? if not, i greatly recommend using one! They work wonders on gauging the correct amount of nutrients and you wont have to "eyeball" it....the temp of the water, acidity, ph all determine ppm as it can vary drastically from temperature of your water!