Aluminum is linked to Alzheimer's. Even the small amounts in deodorants is taking a risk.
Aluminum is one of the most abundant elements on earth. Everyone has aluminum in there body as well as many other toxic element such as mercury aand uranium.
Early on it was looked at but that research didn't lead to anything. Today the
The CDC listed risk factors are high blood pressure, obesity, Diabetes.
Depression, cigarette smoking, hearing loss, binge drinking.
You keep jumping onto single item issues. First it was potassium, Second was iron now CO2. there are15 elements plant need to grow other than oxygen and hydrogen (which come from water). Any one of those 15 can determine if a planted tank is successful or unsuccessful. I had the same problem but quickly went through 7 elements and at that point I still had issues. So I went all the way and looked at all the 15. And only then did I have success. Note there is one thing I have learned:
If your fertilizer doesn't have it and you are not adding it to your water that element has the highest probability of being deficient.
Low tech and high tach have the same goal: insuring plants have everything they need to grow. People with low tech tanks tend to use different methods to achieve the same result as those with high tech tanks. And of corse there is a middle ground that can use a blend of both high and low tech methods. And all of this depends on what is in your tap water, how you maintain the tank how big the tank is, and how you stock it.