That's good, the green hair etc will come eventually, it cycles just like a tank does with algae cycles =). Try and clean the screen if it is completely covered in the brown/yellow algae to such an extent it's smothering any other algaes, that should give a chance for the hair to grow (you can do it more often than once a week, but I'd say no more than every 3 days)
More light is better, would be interesting to see the difference between 18 hours and 16 hours of light a day.
Here are the pics.
Before,
After,
It's white because ther is not enough flow. Or sometimes, because the light is on 24 hours.
What if I flood the back chamber so the scrubber is under water? The display is growing HA like mad and it is attached to rocks.
I have 400 GPH going over the scrubber and it is 8" across. I don't understand how I don't have enough flow. Let me crunch some math. :?
You can move the light farther away (best), or reduce the number of "on" hours.
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