Your babies look happy and healthy.
I'm taking bets on which one I'm going to kill first...
You've got your PH issue figured out now, so you'll be fine.
Keep in mind that the plants growing in perlite and/or coco are soil less and use the Hydroponics PH chart.
The weird difference between the two charts, is that in hydroponics, calcium is locked out above 5.8 and in soil, calcium is locked out below 6.5
Keep an eye out for calcium deficiencies and excesses.
I'm not sure if adding potting soil or compost to coco or perlite means that you're growing in soil?
Keep in mind some nutes lower the ph as well...
... Will continue messing around with compost mixes,...
... Will continue messing around with compost mixes,...
Funny stuff, I had the same mushroom into my soil some days ago..
Likely a Mycena: