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I would be using a horizontalfloating mesh (7 count canvas) with one side only lit from above, approx 10" away. It could possible have fine bubbles from wooden ayirstone, if helps at all
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The "floating" screens I've seen people make have not worked; the screen needs to be up out of the water instead. Or, bubbles from beneath; but then the screen gets clogged with growth. That's why strings are better with bubbles. You could try making bigger holes in the screen though.
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I introduced around 12 acropora frags 1 month ago. phosphate increased from 0.02 to 0.07
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Sounds like what I was saying. Acros are mostly rock, and any transfer of rock through the air kills a part of it, and causes die-off. If the 4-cube scrubber was already thick, the extra phosphate might have made growth thick enough to kill the roots and let go. If so, it should be back to normal soon. Larger screens just have less water access from the edges of the screen, so the middle dies sooner when thick.
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I am not sure if the bleaching of the 4 cube could release toxins
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No, dying algae just put nutrients back into the water.
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My scrubber build with leds on 72 gal
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No pic
This is is very focused; maybe too much so.
Probably better and spread out.
Also focussed but ok for a small screen.
This one probably has good spread because there are no lenses.
For bubble upflows, these lights can be position and sized to the screen size, but will be 1-sided. To make them 2-sided, put a white plastic reflector behind the screen, angled to reflect light to the back of the screen as shown in the drawing. Or just use strings instead of a screen.