thanks man...you really know your shit....one more quickie....do I need to do a complete water change or can I do like a 20-50%...am I just looking to lower the pH due to all the nutrients in the water....on a tangent here but in the aquarium business I can buy a monitor system, you can hook up a pH probe to it and a controler on a CO2 system if the pH jumps to high you could dose CO2 through a reactor to lower pH automatically...This method is not for me way to much $$$ but if you have the means it would be sweet.