algae on sand

[nxb161]

you could have the phosphates being used up by the algae thats why your test reads 0 , it has to be coming from somewhere

That is a good point that a lot of people overlook.

 

[Gti_Leo]

i looked into that the algae disapears at night and i do test for Phosphates in my RO and newly mixed water.

i guess i shoul get a reactor since i already have some GFO i bought to put in my HOBs media catrage