Too much phosphate ?

[SantaMonica]

If there is enough copper to kill scrubber growth, it would need to be removed by water changes or poly filters.

Low levels of copper, of course, do no stop scrubber growth, and the scrubber will remove the copper. But being a fish only tank, it might have been added.

[Floyd R Turbo]

The tank I refer to was completely emptied, substrate thrown, rocks soaked (tested before and after on 2 copper test kits, zero copper).

I cleaned the screen for the first time today (5+ weeks) and the slot was clogged with green, bits of green on the corners, and brown staining (no other way to describe it) on the rest of the screen. I will have to take a water sample next time I stop in and dilute & test it....off the charts, I bet.

[Pulse]

To get rid of copper? Don't get it in there in the first place, otherwise remove the source and then massive water changes.

[kotlec]

That was theoretical question