I'm sure it is a challenge to keep up with tech advances which constantly set you back with changes. I am technologically challenged myself and depend on my 21 year old brainiac son to keep me on track! Back to my water... how much higher FC? I am trying to get it to that 25ppm and hold. Not there yet. Seems to go back to 21-22 FC over night and then again at dusk. Keep adding appropriate dose of bleach to get it to 25. Should that eventually take care of the mustard algae if I am diligent in vaccing to waste and brushing? I'm sorry I am so full of questions everyday...