My ph won't go above 5

If your coco wont come up and you are feeding at the proper ph, you may need to add a little dolomitic lime a little at a time until your coco ph stabilizes at the proper ph. Any garden center should have it. Cheers

get some ph up and down. check ph of water before adding anything. add your nutrients and use the ph up to adjust ph to 6.2 water and check run off until you get a 6.0 getting that ph in check right now will help the plant produce her buds later, right now with a 5 your going to get some lock out issues and your going to see all kinds of issues later.

Hey friend If your runoff is always gauging that high then my best advice is raise the ph of the in going water until you get the right ph in your medium. Maybe water at a 6 ph and then measure the outgoing after running a good amount through. Then test the next watering again and if need be go up a little higher until you can get a balance. I know silica has a tendency to run a high ph so maybe consider some of those additives that have that affect. Good luck happy growing.