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High Nitrate and Algae Isses Plz Help!

2K views 10 replies 6 participants last post by  KH2PO4 
#1 ·
Hi TPT,

I'm having lots of algae (GDA and BBA i think) and High Nitrate levels (40 PPM).


I think ihave GDA growing on my tank glass, bright green color. Is the only way to get rid of GDA waiting about 20 days and when it turns dark green/ brown scrape it off? Is my nitrate levels causing the algae to form?

I also have some dark algae that is attacking alot of my plants. Is this BBA? how could i get rid of this? Please see attached photos.


I did a 50% water change but the nitrate level did drop at all.

I have a 10gal talk with:

- 2 T5s total of 28watts i think (on 8hrs)
- CO2 1.5 to 2 bps when the light is on
- half cap of Do Aqua Be Green for potassium and trace elements
- one stick of Laguna Once-A-Year Fertilizer Pond Spikes 16-9-12

Can someone please tell me what im doing wrong. Plz help

Thanks!
 

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#4 ·
Unless you can find another source of nitrate that can refill the tank with nitrate as fast as you do a water change, then I would suspect that fertilizer stick.
If the only NO3 really is in the water, then as big a water changes as you do cuts the nitrate that much. 50% water change = 50% reduction in NO3.
If you do that much water change and do not see a reduction then there are several possibilities:
Bad test kit.
User error with the test kit.
Hidden source of NO3 that is released when you refill.
 
#5 · (Edited)
I did 75% water change and expected to see 75% reduction (40 down to 10). My tap has just around 3 PPM.

But it was just reduced to 20 PPM.... I had calibrated my test kit and knew
what color the 10 PPM should be.

After searching the net, many people were also having this problem.
Some said vacuuming the gravel helped. But the fact that NO3 is not affected
by CEC of the mulm....hmmmm. Anion exchange capacity? But eventually
after several WCs, it has gone down to where I want now. So I stop the
researching.

Root tabs, in my case, no it couldn't be, I'm sure. I'm anal enough.
But for the OP, I would suspect the stick.
 
#11 ·
#9 ·
Your tank looks rather new, and also lightly planted. I would say instead of constantly cleaning, vacuuming, using chemicals, ect you should plant more plants, especially ones that are known to grow quickly and easily. If you do this these plants will start to consume all that excess nitrate, and by the same token, reduce your algae problem.
 
#10 ·
2 T5s is a lot of light over a ten gallon. WPG rule doesn't work for T5s and they can cause algae in shallow tanks like ten gallons. I am guessing this is going to be the root of your algae issue and not a nitrate lvl of 40.

Consider dropping a post over in lighting for advice from Hoppy.

In the meantime I would really consider lifting the light a foot, pulling a bulb, throwing in a bunch of floaters. Anything to tone down the light a bit.
 
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