I just set up a 29 gallon planted apisto tank, using a DIY CO2 system. The tank has now been up and running for a couple of weeks now, and everything seems to be going well. However, I have noticed some kind of clear/whitish slime growing on the output of my CO2 tube, and the CO2 bubble counter I am using. I assume from the appearance that it is most likely some sort of bacteria. Anyway, has anyone else experienced this? If so, what did you do to get rid of it. I tried to brush it off, but it has grown back within a week or so. Any thoughts on this would be greatly appreciated! 