Its supposed to be 1 tbsp per 5, so 1/2 for 2 is slightly high (would be 2.5 usually), maybe just make it a little under a full 1/2 tbsp? I only just started using it, and I'm afraid of shocking my fish with it since I've had them in regular water for so long that I did half the reccomended amount. You should see how much shyboy benefitted from even that little though!
