|
You have a sand bed? Apparently, as bacteria in the lower layers move up due to overpopulation, they push out phosphte near the top layers allowing it to enter the tank water. Same goes with rocks. So your cyano gets a hold of this free phosphate, and can make its own nitrates from N2 gas dissolved in the water. Nitrate is not limiting to cyano, but phosphte is.
Where is cyano growing anyways? How old is the tank/sand?
Some "cures" have been suggested:
-increase flow
-decrease phosphates
-clean half the sand bed out, add new sand, 2 months later, do the other side.
I think that increases flow, serves only as a means to disturb the area making it harder for cyano to grow on/attach to. Also the flow aids in removing particulates.
__________________
Its a good idea to have a refrence sample for alk test kits. 1.1350 grams of baking soda in 1gallon of distilled water=10dkh. Check your alkalinity test kit!
|