Now I think I know why my cardinals were gettin ich.My ph is 6.0 which I thought was ok for these type tetras BUT coupled with the CO2 injection and a hardness of 4 deg (which is also good) the resulting CO2 in ppm comes out over 100ppm! I also remember having the adjustable flo on my whisper filter set very low thinking to slow the agitation of CO2! Man a little knowledge can be dangerous!! I will recorrect right away.
15gal planted,flourite+volcanite,65 watt pc,whisper 2 filter,5lb CO2 tank and diffuser,flourish .