If cal is at 420 alk is at 7 but don't know what the mag is,should i attempt raising the alk? Went to my lfs to test the mag and thery don't have a test kit for it,lol.
Alkalinity at 7 dKH is fine, but raising it to somewhere in the 8-11 dKH range is very likely to be safe. Magnesium levels low enough to cause immediate problems are very, very rare.
Tank in question is a 33 gallon with 1 birdnest frag and one small gsp. I'll do a water change
and see where the alk stands. If i want to raise the alk to 9 using baking soda,how would i go about it?
I'd probably do that in two doses, over two days, just to be safe. Dissolve the baking soda in a bit of RO/DI, and add it to the tank. This calculator might help:
It requires guess as to the water volume, which is why I recommend caution. My first guess for the water volume in a system like that might be 20 gallons, depending on the amount of rock and sand.
Also, keep in mind that many tanks can consume 2-3 dKH per day, just due to coralline growth, which can be puzzling to people who aren't aware of how much alkalinity a tank can go through.
¼ tsp is a small enough amount that it shouldn't be a problem, but larger doses might cause some precipitation if mixed into a small volume of tank water.
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