White spots and other issues

I have a couple plants with a few different issues can anyone help and give opinions on each

Give us some details on your grow ....

Medium
Water
Ph
Nutes
Temps
Etc.

1 part perlite to every four of Scott's hyponex. Tap water ppm 425 when using megacrop nutes. Ph 6.3. Temp 77 to 82f. 450 watt viparspectra led actual 200w. I got a 6 inch induct infinity s6 cloudline bringing air in and a 9 in. Box fan taking it out. I put verculimite or however it was spelled into the soil also I don't know if it is holding to much moisture or what.

Oh also it is a 3 gallon bucket alot of holes on sides and bottoms I was giving them a liter of water and next watering is a feeding and so on every two days

So I searched the soil you're using on the internet and I came up with some info at another weed site which I don't think I'm allowed to link to but if you search it you'll see what might be the issue you're having, it's possibly soil related

Hyponex is mulch. Not potting soil. I am guessing acidic pH.

Wow because it seems just like soil but you are making alot of sense the ph in my tap water is about 7.5 the last time I watered my plants I did not use ph down and literally they have been growing better now lol and looking better