seffieuk
I used to be indecisive but now I'm not so sure!
I assume thats because all the phosphate is being 'used' by my GHA!
I'm just too lazy to dig out my external filter at the moment, so gunna use them til i can find the energy to dig through my cupboard.
Get off your bumpty girl, it will be much more effective in the external than just hanging in the tank and yes, you are quite right, I expect the gha is using both your phosphates and nitrates