Bubble rate on UAS

[inky]

Has anyone noticed a correlation with bubble rates and algae growth on the new UAS? Also, bubble size.

I'm using a standard 6" airstone and air pump (rated for 12" airstone) and not getting good growth :( Using red and blue leds (from memory 16 reds and 4 blues) @ 700mA on a 6" x 7" mesh 7 screen that's been roughed up - it is only lit on one side. After a week, not enough growth to harvest. The scrubber has been running nearly 3 months, I have GHA in the tank and nitrates of about 30 :( Because I do have GHA in the tank, I've got 2 of these going, to try and remove the stuff.

So, wondering if the bubble rate is too much, incorrect size of bubbles are effecting the growth.

[SantaMonica]

Can never be too much.

Seems like a lot of Blue.

Need pics to tell any more.

[inky]

Haven't got time to take pics tonight, but the problem could be bubble time on canvas.......

[Floyd R Turbo]

Well I run a 4x6 UAS with 6 red and 1 blue on each side (14 total LEDs) so if it were single sided that would be 6x8, so you're not that far off. A little excess on the blue which is inherently more intense than the reds, (are you running 660 or 630 red??). I would remove 2 of the blues and put a diffuser plate in front of the LEDs, and put black dots on the diffuser with a sharpie right in front of the blues to knock them down. Could also do that with the blues you have and not change arrangement. Diffusion will definitely help though.

[alex leblanc]

I'm using 2 660nm and 1 455nm blue on a 3.75x4 screen with no problem.

[inky]

It's actually 18 reds (660nm) and 4 blues (455nm), I could replace a blue with a 660nm red, which would give 19 red and 3 blue......