Planted Tank Guru
Join Date: Jun 2004
Location: Baton Rouge, LA
For that, equivalent to a normal daily dose of Excel is 0.0525ml.
Double dose for killing algae is 0.105ml, and so on.
At those tiny dosages, I doubt the methylated spirits will be a problem, but I can't guarantee it. Use at your own risk.
Not to mention it's impossible to measure such a small amount. I'd mix 1/4 tsp. Glutarol with 1 tbsp. distilled water. A daily double dose of that mixture will then be an easy 1/4 tsp.