Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I put teaspoons or tablespoons into 2 liter bottles of water, then dose each tank based on its size using a turkey baster or syringe (no needle) to get the right ml for each tank. The turkey baster I found has ml marked on it. The syringe barrels are marked in ml, also.
For aquarium fertilizers if I can get it to the right ml that is quite accurate enough for me.
I use the smaller syringe barrels marked down to the .1ml for other uses, like portioning out flea control drops.