Hi Pat,

without the green water how would you make the nitrate level down as low as 5ppm.

I have been keeping ranchu in 5ft tank, and the nitrate is always about 25-45ppm. not untill switch to GW, then i can bring the nitrate level to 5pm

and other benefit of GW is that i dont need to do a lot of water change and yet the nitrate still low.


rgds,