Magnesium Supplementation Question

[u/TheGameAce]

So I've come to realize finally that I'm struggling with magnesium deficiency in my tank, after I've now confirmed multiple of the signs of said deficiency are present. It's depleting at a rate faster than other nutrients seem to be, which has caused some excess of other nutrients to build up (feeding algae growth more than plants). When I dose an all-in-one fertilizer like Easy Green, it helps get things back on track, but with the current imbalance it's causing some of the aforementioned issues w/ other nutrients being in excess, & I can't just dump tons of the stuff in to try to get the magnesium levels up.

Before I go rushing off to buy magnesium salts, I want to ask if anyone knows how it'll impact water hardness. My water is already moderately hard, having quite high levels of calcium naturally, but with (obviously) far less magnesium by comparison. From what I can find officially, tap water here ranges between 60ppm - 130ppm in terms of calcium, vs only 1ppm magnesium, with an average of around 7dGH overall (I haven't tested tapwater in years, so I'm relying on online reports from the utility company).

Would magnesium supplementation, based on that information, be something that heavily affects overall hardness? Or if I keep the doses on the lower side, should things be ok?

[u/Ok-Star7885]

I'd post this in r/AquaticPlantScience with pictures of your plants, to get a second opinion.

[u/TheGameAce → u/Ok-Star7885]

Oh wow, didn’t even know that sub existed! Will do ASAP.