Don't measure in drops. Measure in milileters like the label says. For each gallon, you'll need half of a millileter. So for a 2.5 gallon tank, you should use one and a half millileters.
However, if you're using this as a water conditioner to remove chlorine and chloromine, use something else. Stress Coat is not as effective as it used to be.
answered 2 years, 7 months ago
1out of 3found this answer helpful.
My educated guess would be to add a 1/2 teaspoon. I have a 2.5 gallon tank too and I'm going to be putting a betta in it so that's what I'm going to put in.
answered 2 years, 8 months ago
2out of 2found this answer helpful.