10- 20 Gallon Aquariums
+/- 1/8 tsp KN03 (N) 3x a week
+/- 1/32 tsp KH2P04 (P) 3x a week
+/- 1/32 tsp (2ml) Trace Elements 3x a week
50% weekly water change
taken from here:
http://www.aquaticplantcentral.com/forumapc/fertilizing/15225-estimative-index-dosing-guide.html
kh2po4 contains phosphorous and is used to dose that and potassium if you are low on each.
k2so4 is used to dose potassium.
kno3 is used to dose nitrates which your fish ideally should provide unless you stock low to intermediate.
plantex csm+b is used to dose micros and will replace flourish trace and comprehensive for the most part. DO NOT overlook that one.
since you are already considering going dry i would get a pound of barr's gh booster while you're at it. it's good just in case you have issues with your water supply. if you need to use r/o, distilled or bottled water you can always match your water with a little calculation and get through bad times. don't forget baking soda if your kh is low also.
one tablespoon of either kh2po4 or csm+b (trace) can be mixed with water to make a 250ml bottle of stock solution. a tablespoon doesn't even dent the pound you'll recieve in the mail. compare that to the price of seachem products and you'll see a major difference in price over the longrun.
also i believe on aquariumfertilizer.com if you get 5 1lb items the shipping doesn't increase. that can save you a buck in the longrun so i'm all for it.