Calcium 62 mg/l (1 mg/l equals 1 ppm, right?)
Total iron <20,0 μg/l (I've no idea how much that is in ppm)
0.02ppm. one mg is 1000ug.
I live in Europe and the numbers are given in °fH (French degrees) - I tried to use online converters but I don't know how to use them properly, so I give you the original values in °fH
Based on a converter I found with google it appears 1FH= 10ppm CaCO3 equivelent.
So your 17fH is about 170ppm and your KH 13fH is about 124ppm KH. Your water is a bit hard with a calcium to magnesium ratio of 16 to 1. Commercial GH boosters average about 3 to 1 or 4 to 1 Ca / Mg ratio.
Nitrate - 13.2 , Nitrite <0,02
This indicates your tap water probably has some nitrate in it. You need to use a nitrate test kit to determin the amount in your tank.
Potassium - 1.9 ppm
There is a chance you are deficienct in potassium. It depends on how much is provided by the fertilzier.
I keep getting these holes in the Anubia leaves, like in the 1st picture. Makes me think of a K deficiency, but not sure. I know holes in the leaves usually means K is low
Holes in the leaves can be caused by a number of different deficiencies.
Since I've recently floated a whole bunch of Anacharis at the surface
Anacharis is a fast growing plant. Adding it to your tank increased nutrient consumption so that the Anubias is now having difficulty getting what it needs.
The high calcium and levels in your tap combined with essentially no N and P in your fertilizers. Has probably resulted in a N and P deficiency and possibly a magnesium potassium deficiency.
Monitor your tank nitrate levels with a test kit and try to keep the nitrate at 10ppm. I would also add 1ppm of phosphate. This would also add quite a bit of potassium. I would also add about 15ppm of magnesium sulfate (Epsom salt) to get your calcium magnesium levels a bit more balanced.
You can use Rotalabutterfly.com to hep determine exactly how much to add to reach the targets I suggest.