Well I was talking to the nice girl at the lfs today and mentioned that my brown algae is not going away she said its most likely is hi phosphates and to use a phosphate mover or neutralizer. I mention im dose NPK and she said to stop or dose less phosphorus.
So phosphates come from the phosphorus I've been adding. Should I stop all together for say a week or two or just cut my dose in half over the same time frame?
Phosphorus is an essential element for all life forms. It is a
mineral nutrient. Orthophosphate is the only form of P that
autotrophs can assimilate. Extracellular enzymes hydrolyze
organic forms of P to phosphate. The effect is studied of
different phosphorous concentration on changes in growth
rate of diatom species isolated from Tones River. All
diatoms examined increasing cell division rate with
increasing phosphorous concentration in the medium.
Diatoms, however, were not able to dominate when
phosphate was deficient, although silicate and nitrate were
So I'm going to stop dose phosphorus for two week and see if it helps and if it helps I'll start dosing again at about half the recomended and slowly raise the dosage over time.
We really do not have enough details to help you based on the information provided.
Pic of the tank?
Plants? What type, how much, CO2?
Ferts are essential and perhaps the easiest thing in the hobby, but many still have long blamed them for algae and as I often tell folks....."a good myth is very hard to kill".
I dose 10-15 ppm PO4 a week to this tank:
10 ppm to this one:
Algae can be due to many things, but mostly....it's due to folks not addressing the plant needs, which light and CO2 are the dominate issues for 90%(maybe more) of folks having algae issues vs say ferts.
I thought brown diatoms were caused by high silicates. ??
When mine didn't appear be getting any better and in fact seemed to be getting worse even after 3-4 months I finally added PhosZorb to my filter. It made a noticeable difference rather quickly. After several weeks they were gone. I don't know if it was just a coincidence they cleared up when I added the PhosZorb or not, but when they started again after changing my substrate I put the bags back in and they started going away. Again could have been coincidence. But to me it seemed to help. I dose extra Phosphate to put back in what is removed.