yeah, well i think my co2 is the problem, i run a diy one, however when i do the calculation for co2 , from Kh and Ph, i get only about 4-5ppm co2, so i set up a better system, the co2 comes out into a type of "bubble ladder", where it builds up, and when it bubbles out, it goes into my powerhead where it get blasted out in a million bubbles, hopefully that will help.