I am dosing DT plankton (keep it in the beer cooler at 1deg C) every other day. I am using 1 cap full. I would say that this is about or little less then 1tbs. The tank is 55G and the sump is 20 (filled with about 15G). I am in the process of vacuming my substrate right now. I just snapped some pics so you can see how its looking. I will stop using the tap water very soon, after the holidays. Has anyone ever thought of using destilled water from there basements dehumidifier? Will this work, instead of a RO/DI i would like to get a humidifer and kill 2 birds with 1 stone sorta thing.