tsp:ml conversion question


Junior Poster
Jan 22, 2009
Hello - got my my dry ferts from Greg Watson yesterday and starting EI dosing on our 90 gallon. I have a question on the dosing for Trace, though. Per the "EI Light" overview, dosing is as follows:

60 – 80 Gallon Aquariums
+/- 3/4 tsp KN03 3x a week
+/- 3/16 tsp KH2P04 3x a week
+/- 1 tsp once a week (water change only)
+/- ¼ tsp (15ml) Trace 3x a week
50% weekly water change

It says 1/4 tsp (15ml), but 15ml would be three tsp (one Tbs)? I'm sure I'm overlooking the obvious, but did a search and came up short. Just don't want to screw this up!


Lifetime Charter Member
Lifetime Member
Jan 24, 2005
Sacramento, CA
The "1/4 tsp" refers to dosing the dry trace mix. The "15 ml" refers to dosing a mix of water and trace mix, the proportions of which I don't recall, since I never have done that. I always simplify this by dosing the same measure of CSM+B as I do of KH2PO4. That's close enough.