Phalaenopsis with dull leaves

[wasillisaw]

Hi.

In january I've bought myself a baby phalaenopsis, and ever since I took really good care of it (it even developed some algae, which I've removed with hydrogen peroxide 1,5% after watching some tutorials). I mist it with water everyday, just like my other orchids. It looked very happy, but after a few months I noticed some white fungi stuff appearence on the potting medium, so I've decided to repot it with new potting mix and a fresh pot. I have cleaned the roots with hydrogen peroxide and washed them throughly with water.

Everything seemed okay for about a month, but now I have noticed that its leaves started to feel like leather, and they're dull. There's also a subtle discoloration to the leaves, but they're not wilting.
I water it every 7-9 days, and the pot I'm using is very well ventillated. The roots look completely fine, they are green and growing.

Still, I'm really worried about it and I have no idea what might be going on. I've did some research, but after a lot of digging the only thing I've learned is that the watering may be insufficient or it may be overwatered.
Unfortunately thats not the case, because I pay a lot of attention to the watering and my other orchids are thriving.

Im adding two pictures of it, so you can see for yourself.
It's a little wet because I sprayed it with water few minutes ago.

I need your opinions guys, please help me save her