get some diatomaceous earth from a online, or nursery. Call around, most don't carry it. Don't get the pool kind its to weak. 8 bucks but will last for years.

Non-selective contact killer, DE is the fossilized remains of single-celled creatures called diatoms. Each fossil has sharp edges that irritate and lacerate soft-bodied insects. The DE material abrades the exoskeleton of insects, causing dehydration and death. Effective on almost all crawling insects. Insects cannot become immune and will die within 48 hours of contact. Safe around children, pets and wildlife. Long lasting, odorless, non-staining.

The shells provide nutrients and silica to the plants, and it's organic too.
3% magnesium, 33% silicon, 19% calcium, 5% sodium, 2% iron and many other trace minerals such as titanium, boron, manganese, copper and zirconium.

Also try potato slices on the top of the soil. keep them there for 24hrs and you might have some bugs on the bottom of them and throw them away.

That should help with the bug problem.