Lowering the pH by adding peat moss to the filter helps your plants compete
with the algae better. Most plants grow best at pH between 6.0 and 7.2 . It
worked for me, but YMMV ...

Limnophile

"Velvet" wrote in message
...
phosphate is around 0.25 mg/l. I guess that the
ph number is high and also the gh level because of the local water
coming
from reservoirs on chalk/lime hills near my home, but I have not tested