Well....the Mrs bought me a case of Dos Equis so now I'm sharing that with the tank...must be sale or something. Up to now, tank's only been getting Heineken or Corona. For the reef geeks out there, I'm dosing about 2 oz (or 60cc) of beer about every other day into a 400G system. I figured this out very scientifically. It took me 6 swig to finish my 12 oz beer bottle, so I must be dosing 2 oz each time. I have my beer 'frig in the basement near the tank. So when I grab a beer from the 'frig, I pop the cap, take swig and also give the tank one also on the way by it.