pkgross's thread on aerating GBs to get more oxygen to the plants got me to thinking; Speaking of oxygenation, the house my son bought here in Montana, had an oxygen machine in it ...... (I've got to bring it over here and see if it works) .... you know, one of those machines that people use at night when they have to have oxygen lines stuck up their nose? Well, I'm wondering if the oxygen from that is pure oxygen, and if it is, would pure oxygen be too much for plants and fish ...... If I get no knowledgeable answers, I think I'll try it and see ....... I've got to do some Googling too ......... I'll have to re-design my GBs, and run some supply tubes under the gravel, but if it would improve the oxygenation of the water, and quit rotting the base of the plants and the roots, it seems to me that this could be a good thing