First Grow Attempt

@FullFuzzy, as you mentioned they have wings and are tiny flies I'm looking more to fungus gnats, let your medium dry out a fair bit and make sure it's 2 inches dry on the top as if left wet for to long they will lay larva and if the top is wet for so long. Soil you can get away with watering 3 times a week pushing 2. Make sure air is blowing on top of your soil, cut back on watering for a few days, if that doesn't solve it apply sticky pads to misting the top of the soil evenly to kill the larva, I haven't done it with coffee grounds so I can't say anything to do with that I'm affraid, it's not necessary to check run off PH to the soil PH as long as what's going in and I personally would aim for PH6/6.2, I haven't used bio verge and I've just did a quick look and that's rich in nitrogen which is vital for the vegetative stage and should not be PH adjusted. Most tend to use calmag or epsom salt to treat that deficency

@@@Ajwardy18, the flies do seem to jump out when watering, is there any other way to differentiate them from gnats? They're quite tiny so they're hard for me to identify properly, they're small & black. Not sure of the humidity, will see if I have something to measure that, temps are stable at above 20C (even through the night), reaching max 28C on hot days, usually at a more comfortable 25-26C. I tried using an old tool for measuring the soil PH a couple weeks back and it was saying 7 PH which seemed too alkaline based on what I added to it, but I covered the topsoil with some coffee grounds to try and improve the PH regardless but haven't checked since then. The tool was a little dirty & in storage for a good while so I wasn't sure of the accuracy, but I might use it on some other soil to see whether I should trust it, and measure the soil PH again. My soil is a combination of Coir & Soil, so should I be aiming for around 6.2PH? With the magnesium deficiency, would my nutrients (Bio Vega) be able to help with that or should I get something else to address that? Thanks for the advice EDIT: They do have wings & fly around pretty confidently, it's to my understanding that springtails don't have wings & just hop? Thanks again