I know too much light but I have a TON of co2 and EI ferts. I believe it is from lack of something but I dont know what.
Is this due to PO4 or that the PO4 limitation reduced CO2 demand, thereby curing the issue?Hi bsmith782,
My GSA seemed to be caused by low NO3. I used the Method of Controlled Imbalances (MCI) and have almost fully eliminated my GDA. It involves increasing KNO3 until GDA is eliminated and replaced by GSA, then increasing PO4 to eliminate the GSA. It took a several weeks, and I ended up increasing my KNO3 dosage by more than 3X EI dosage, but it worked and my GDA is gone. (FYI, even with the higher KNO3 dosage, I found that my NO3 levels were about 5ppm after 24 hours.) I am in "phase 2" where I am increasing my dosage of PO4 to eliminate a small amount of GSA I am currently getting. You may want to give the procedure a try.
At 3x EI, there's no way the NO3 could be 5ppm.............
This would imply uptake rates of 15ppm or more per day of NO3...........
Try less light.
Will do the same thing, more available N, P, CO2 etc.
That, and stable CO2. Then once the plants are doing well and algae, free, back up to the old light intensity.
The only times I've ever had GDA was when the CO2 was low. I have 5 tanks, all get the SAME dosing, same sediment in 3 tanks(ADA AS) one with Flourite and then Dolomite in one. Light is about the same also, maybe off by 10-20micmols depending. So nutrients are the same, the sediment is not a factor, the light is not either.
I could not induce GDA for the life of me in the other tanks.
Without consistent induction of algae at the blooming stage, you cannot test anything for algae.
That is standard protocol for algae test in research.
Just 2 and the only the one's with poor CO2.
When the CO2 was tweaked and fixed, the issue went away in both tanks at the same time.
I cannot say 100% that was it. But I know it's not a nutrient or sediment type issue, tap water, water change etc.
Those had no impact and yet the algae went away and has done so consistently.
I'm not saying mega dosing nutrients or KNO3, or dropping PO4 down is going to do anything or not, only that it cannot be the cause or the only reason.
I think someone is implying that to be the case.
I have not seen evidence that demonstrates that nutrients are the cause of the problem to begin with.
No one also seems to be able to consistently induce GDA either.
I have fairly low intensity now, that was changed in one tank, but not the other. That seemed to reduce it.
But CO2 seems to be the largest factor, the aquariums both had wet/drys, but I've had it in high light canister filter tanks also, but again, in that tank, CO2 was it.
Nothing wrong with mega dosing nutrients. I suggested this for competitions and doing them the day prior to a water change to fatten plants up.
If you try and change the ppm's of NO3 or PO4 around etc, you are bound to get some effect I figure.
Does not hurt to try.
But it still does not imply cause, or that there is another factor that is influence, eg, limiting one nutrient STRONGLY influences CO2 etc......since CO2 is not tested independently, you cannot say if it's the nutrients limiting CO2 demand, or the nutrients themselves causing the effect.
Algae are rarely limited, plants virtually always are to some degree.
Limiting PO4 was very popular, and plants can handle PO4 limitation fairly well, so you will still get growth, but reduced CO2 demand, this is why many assumed PO4 excess = BBA.
However, I have crazy imbalances and no such issues. In order for the theory to hold true, you must test the other side of the coin there to make sure it was not CO2, rather than limiting PO4 or NO3, or Fe etc.
Indirect effects are one reason why correlation does not imply cause.
This was true back when PMDD came out.
They stated similar things about algae, but much less ppm's.
I've observed a lot of tanks with CO2 issues over the years.In my tanks the only algea that I would say coincide with low/fluctuating co2 is bba at the light levels I have. The only fluctuations I have is that (according to my drop checker 2cm off the substrate in the lowest flow area of the tank) co2 seems slightly low for a few hours after the lights go on. But this could also be the fact that drop checkers are a slow reacting indicator of co2 levels. I had BBA a bit after I got back from vacation and the tank water was down about 4" and the splashing caused levels do get low even during normal full saturation times.
Believe me I am about the biggest proponent of low/fluctuating co2 causing just about EVERY algea issue. It has been consistently good (back from vacation) for about a month.
So you think I should just wait it out?