I'm ok with that, it's suppose to be a more readily available source of carbon for plants. I could never see the effects of flourish excel which is why I always questioned how well it works. It's definitely not an economical way to add co2 to the water. I have seen the effects it has on algae and excel sensitive plants thoughFair enough. The glut content put me off at first, but I've generally made peace with it lol