How much ammonium chloride would i need for a 20L?

[PegasisR]

How many ml would i need for a 20l to feed bacteria? its got no sand and no rock :) just an HOB and a heater is all! Ammonium chloride used is from dr tim at 4drops per/1gal

 

[John Neuzil]

Isn't the answer in your question? Measure how many ml does 4drops per gallon come to.

 

[PegasisR]

Isn't the answer in your question? Measure how many ml does 4drops per gallon come to.

So it would be around 4ml!