First time UAS

[IAmNotGr33n]

Hey forum, new scrubber guy here :-)

I build a UAS scrubber like the HOG but i haven't seen any growth in over a month.

Scrubber without bubbles
5197

36watt led lamp
5198

I am only getting light brown stuff on the screen, but then again my PO4 is 0,00 ppm, I have been dosing NPK fertilizer to promote algae growth but nothing is helping, my NO3 is rising a little.

There fore I can use a little guidance...

Let my know if you can't read/understand as English is not my best language :-)

[SantaMonica]

Welcome from Denmark.

I'm sure the light is too strong. Put a T-shirt over it, and run it only 12 hours.

Bubbles need to be very strong.

[IAmNotGr33n]

Thanks for the welcome, I have added a T-shirt , by strong you mean fast big bubbles right.?
One more thing how do you add the air holes in the tube, I believe I have read that slicing is not the way anymore?

[SantaMonica]

Yes fast big bubbles are always best.

You can slight the tubing with a razor blade.

[IAmNotGr33n]

How long between the cross cuts ? A inch

[SantaMonica]

That's good, with a unit that size.