Hey all! I've received quite a few questions over the past month or so asking how I dose ferts in my 3g nano. To save time responding to each PM, I'm making this thread so I can just link people to it.
First off, this information has been posted here before, but it's generally buried in the middle of a thread. I was going to post it to my Broken Bridge thread, but then decided that wasn't solving the visibility issue. I'm not making this out to be some stellar, unique idea as hundreds of people here have been doing this a long time, long before I planted my first stem of cabomba, I'm just posting it to make it easier for new nano-keepers to find.
I use KNO3 and KH2PO4 from Greg Watson (EI). Since measuring out 1/224th tsp of KH2PO4 isn't really feasible, mix the dry ferts in water and dose them with an oral syringe. So, for example, 2tsp of KNO3 and 1/4tsp of KH2PO4 will gives me about 80 doses of ferts for a 2gal tank (I use this calculation for my 3g tank too - it's close and helps me avoid over-fertilizing). I measure that out into a container, add 800ml of water and then dose 10ml of water at a time. Not only does this make measuring more reasonable, but I only have to measure with the teaspoons once every 10 months dosing it twice a week. Saving time and effort is always a good thing.
For micros I dose Flourish at the recommended levels, .25ml in the case of a 3g.
BTW, I came up with mixing enough for 80 doses completely arbitrarily. Mix more or less as you see fit.