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Discussion in 'Algae Scrubber DIY' started by Tim, Sep 17, 2017.
Still doing incredibly well; lid 17 hours per day .
1,5 months ago I placed two big blocks of marine pure in my tank too see what would happen. Despite feeding a lot, I notice by scrubber is growing a bit less and I also noticed some diatoms (I think) developing on the sand. So I decided to check the water paramaters to see what is going on.
It turns out no3 is way lower than before; instead of 3.0.. it has dropped to 1.0 !! Apart from that po4 increased from 0.03 to 0.06. I do not like to jump to conclusions.. but I think the is some denitrification due to the marine pure blocks which is driving no3 too low; inhibiting algae growth.
I will probably remove them to restore the No3 : po4 balance, I fear there will be a cyano outbrake if the growth of hair algae is restricted and po4 keeps climbing.
On the other side I think this is very interesting moment.. as I can test too what extend po4 is removed by algae when no3 is limited.. I can tell by the about of growth and testing water parameters. I will remove 1 block by the end of the week, test for no3/po4, and leave the other one in there too see what will happen.
Building new led light;
In between MX-4.. I hope this is going to be a bad-*** light. It will light the scrubber much more even now.
Today I finished the new led build. results:
So far the led is performing really well, the heatsink becomes just a little bit warm. I also notice now the scrubber is maturing there is a thick layer of hair algae that just does not come off easily. I really have to scrape hard to remove the algae. Is this normal? Or should I leave this layer and just scrape off the excess?
The scrubber is still lid 17 hours per day. Flow increased; the scrubber is fed now by a jecod DCP5000 at 40%.
Your tutorial on soldering also helped out a lot bud, unfortunately my iron did not became hot enough to quickly apply the solder, but it looked much cleaner than before. I will light the scrubber from 2 sides for now.. I think that would be overkill. I already have a hard time getting enough algae on 1 side. I have too feed a ton..
that also makes me wonder if I should leave the bottom layer of algae.. when the scrubber is scraped off clean.. I guess no3/po4 will rise a bit initially and affect stability a bit..
Doing partial cleanings or "pruning" is always a viable option. I try to leave anywhere from 10-25% of the growth in tact. I just take a plastic scraper and "drag" is over the screen to pull growth away, rinse, and leave whatever stays attached behind.
A less aggressive method is to use the corner of a scraper and scrape lines about 1" apart in an "X" pattern on one side, and a "#" pattern on the other, this leaves patches behind that don't intersect from one side to another which allows light and water flow to get through to the base of growth pretty well.
Intermediate/partial harvests can be done more frequently, like every 7 days or so, doing that 3 times in a row and then doing a more aggressive harvest is a good plan, then repeat that.