Adding supplements/nutrients while using bti and nematodes

Hey everyone hope you’re having an awesome day!

I’ve got a small fungus gnat issue I plan to treat with bti. Post that I am going to introduce some nematodes.

can I add my silica or calmag when watering while using the above or best to stick to my ro only.

thx
Tim

I would personally deploy the nematodes without the Si , ca & MG and wait to see any changes.