Paph pH & Nutrition

[AdeleDS]

I've got a little baby Paph 'Angel Hair' (St. Swithin x Sanderianum). The plant is in a 2-¼ inch pot and its longest leaf is 5.5 cm long and 1.3 cm wide. It seemed to be growing slowly (thought I know they're slow growers), but then I read that Paphs need alkaline water, and I've been giving it my local tap water, which has a pH of 7.7. So I started putting a little baking soda into its water.

And then I read that it needed calcium & magnesium. So I started also putting in a little crushed calcium citrate and a bit of magnesium bisglycinate (because I already had both of those supplements).

Plus, I moved the Paph to a warmer location in my apartment, with a little less light than it had before.

And, it started growing quite nicely; a much larger new leaf grew, and now it is starting another.

Now I see that the my local area is going to increase the pH of my tap water to 8.3/8.5 this year.

My questions: with the increase in water alkalinity, should I stop adding baking soda to the water? And, is the whole calcium/magnesium supplementation a good idea? I also feed it weakly from time to time.