Jump to content

Lowered Production of Macro Algeas in Refugium


Recommended Posts

So, I did 2 things over 2 days to change the water chemistry of my system:

1. boosted Mg from 1,320 ppm to 1380 ppm and

2. increased the Ca from 410 ppm to 440 ppm.

one day after (3rd day), some of the larger-surface more leafy macro algeas lost their color. Algae production is still slow in refugium and surface algae on glass in display tank is also slow in growing.

Everything else remained the same, lighting, duriation, feeding, dKh...

After conducting additional testing, I found that the Fe is down to approximately 0.05 ppm or less. Ran test twice with similar results. Never tested it before, so there in no background for Fe.


I have perused the net and am going to get some chelated Fe today and was wondering if any body doses for Fe?

Link to comment
Share on other sites

Algae of any kinda needs NO3 and PO4 to grow. You have plenty PO4 but not enough NO3.

With extremely limited NO3 I wouldn't see much growth.

Mg needs to be in excess of 1600-2000 to have any impact of algae growth. I usually run my mg at 1450-1500

Your Fe is low as well. Fe isn't critical to algae growth however at lower Fe levels you may notice bleaching and a lime green color instead of a dark green color. Your limiting factor remains your NO3.

Link to comment
Share on other sites

Thanks, Reburn. I have wondered about the NO3 being too low, the growth rate was very fast and to see it just stall like that is very confusing and could be starvation of some kind.

I remain unsure of where to go...do I turn off my skimmer and over feed, to increase nitrates...? Sounds so counter intuitive and wrong and dangerous.

I am leary and still at odds with myself about this... the Iron is definitly helping with coloration and it appears like the production is going up...too early to be difinitive.

more / later.

Link to comment
Share on other sites

  • 4 weeks later...

OK, so I did two things to system: stopped skimmer for 2 days and increased Fe. Algae production is back to normal and everything looks better...

THANKS for all the help. Looks like the No3 and Fe were too low...?

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • Create New...