Hello - @bluter is right re BioBizz pH - 6.0-6.4
The worm castings will have lots of N which will be hard to balance with CaMg/K though, so you might want to find a high K feed with kelp extracts to supplement, such as off the shelf tomato feed
Keep a close eye out for fungus gnats too or you may end up needing to spray the medium regularly
The worm castings will have lots of N which will be hard to balance with CaMg/K though, so you might want to find a high K feed with kelp extracts to supplement, such as off the shelf tomato feed
Keep a close eye out for fungus gnats too or you may end up needing to spray the medium regularly