Leaves starting to turn brown? Help plz

So my baby is around 16 days old now with good progress but I'm now starting to get some leaves turning brown ish (pics)

Light: 200w cfl with reflector
Soil: biobizz all mix
Water: tap water with ph - 6.5
Running 18/6 cycle
No nutes as of yet

Not done anything other than water when soil is thoroughly dry, and my girl to sleep at night

Should I snip the browning leaves ?

You might want to cal/mag the water next time.

Is that leaf getting pushed on to the surface of the soil during watering?

dont cal mag anything yet. plants look nuked. im no expert on biobizz. all I know is that it is an organic soil. The bad thing about these soil mixes (foxfarms, biobizz, etc) is that they are almost never consistently made. They try telling you organics will not burn plants, but your picture is proof that it does. I would use much less water for watering and water more often. By drenching the soil you are making the organic compounds release much more nutrients that are now sitting around waiting to fry new roots. By watering much less you encourage roots to reach out to much drier soil that has less of a nute charge. If your soil has any lime (limerock, oystershell, etc) DO NOT add any calmag. As for your tips turning brown... most likely ph problem. Check runoff. If too far from intended range flush with water phd to counter act. if runoff is at 5.0. flush once with 8.0 water. if runoff is at 8.0 flush with 4.0 to 5.0 water. its much easier to correct low ph than it is high ph especially of lime is your cuplprit. Do not cut these leaves off. let the problem consume it. If you cut it off, the problem will quickly relocate to newer growth