serval
New member
Dakota,That is really interesting. With fw planted tanks, changing the light regime (usually to lower rather than higher) also seems to de-favor certain pest algae. I also changed lights recently, about the same time I started with GFO. So, it is hard to say if the light change or the GFO (less PO4) started mine on the decline. FWIW, I went from a 13,000K Giesemann Megachrome 250 MH plus 4 actinics to a quite different 20,000K Elos Spectrachrome 250W MH plus actinics. (After the appropriate acclimation) I also lowered the light, effectively increasing the light in the tank.