OK I am going to bite the bullet and try to add CO2 to my 200 gal tank w/ wet dry trickle filter. I have read that the CO2 loss through the trickle filter is not as bad as one might expect.. http://www.hallman.org/plant/booth2.html#a Can anyone else confirm this? I was thinking of using a solinoid control on a timer w/ electronic PH monitor w/ probe as controls. Any recommendations on equipment supplier? Best reactor type? Any recommended models or equipment? Thanks in advance. Al _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member