Join Date: Jan 2012
Location: Indianapolis, IN
yeah, you won't be gassing your fish with DIY.
i use 1/4 tsp active yeast, 2 cups sugar, 1/4 tsp baking soda (to buffer pH), and a few drops of vegetable oil to prevent frothing, and i don't even get 1 BPS. but it's enough to make my plants happy. this is in a 5 gallon BTW.
i don't even know if 1G would be enough for a 40B tank... you might want two bottles. up to you, really.