Does anyone have any experience with Ista CO2 tablets for the planted tank? If so, what are the ingredients? And, more importantly, does it work? The videos I've seen suggest that the gas goes straight up and gasses off without any consequential amount dissolving in the water. Also, there is a product called 'CO2 tablets' produced by a company called Medley Pharmaceuticals in which the active ingredients are two antibiotics.... which surely isn't the same thing, is it? I can't find the MSDS literature for the Ista product. What are we dealing with here?