Need some help with my Habanero Cappuccino plant.

This is my first time growing peppers (or much of anything) in soil from seed. I’ve successfully grown out several mini jalapeños (pot-o-peno variety) in a little hydro unit in my closet. I have/had zero extra money to do this so used things I already had or could find. The issue is the leaves are starting to curl at the edges and look a little off colour. I have an Aji Charpita right next to it in the exact same set up, right next to it, that seems to be doing fine. They are near a window but also have kinda cheap grow lights on a 12hr timer (that’s as high as they go unfortunately. It’s very very dry in my apartment (Alberta, Canada) so maybe that’s an issue? Here is some pictures of the plant itself, the lights, the fertilizer (house plant directions. It’s what I also use in my hydro unit), the soil (found in my garden shed from previous tenants), and the charapita next to it that looks to be fairing pretty well.

Other potential issue I can think of is that I put a couple grapes and wilted lettuce bits in the bottom layer of the soil hoping it would provide some nutrients and compost. Now I’m wondering is that was a mistake. There is some fruit flies around them both.