Same exact reasons and method I use. I make up stock solutions from dry powder form. I just use chuck's calculator and know how much of each solution adds how much ppm to each tank. Real easy to use one bottle of KNO3, one of plantex+csm, etc. for all my tanks. I also run a daily dosing schedule where I dose macros on one day and micros on the next. Having stock solutions makes it real easy to maintain this type of dosing schedule.gpodio said:I used dry measure, don't really need to be 100% accurate. I used Chucks calculator to make the initial batches of liquids.