I must say that watching tis stuff grow is very interesting. It is very different every day. People who like "pearling" would be surprised. It is often almost completely covered in large O2 bubbles. I may have to be careful about O2 oversaturation. I read that ~110% can kill fish by giving them a stroke via O2 bubbles passing through the gills. Gassing O2 out and CO2 in is my main question right now.