Do you have those "sticky" traps in the plant stores? It is like a small square piece of cardboard with a sticky glue surface. Also; You could try a few drops of plain dishsoap added to your plants water as well to help with the ones below the surface. The soap feeds the plant and kills bugs. There are many common remedies for bugs...if you do a search on this website you should find an abundance of ideas, many readily available at any supermarket.