Hello! I have been working on a container garden on my little apartment porch; I am growing green peppers, tomatoes, herbs, flowers, and a lime tree. I live in the caribbean, so the weather is consistently sunny and somewhat humid. My plants loved this at first and were growing so well. However, I have in the past month developed a terrible insect problem. Ants moved into the pots, as well as what looks like millipedes (they are about 2cm long). There are also aphids, whiteflys, and mites. The one thing I don't have (I think) is snails. I have tried several kinds of commercial organic pesticide to no avail, and I tried putting my pots in a tub of water to soak and drown the ants. The ant bath worked at first but then more moved in again! These ants don't go for any brand of ant traps, either.
What is the strongest spray or treatment I can use that will kill all these baddies but is food safe? I also have a little friend gecko that visits my porch, as well as a dog, so I don't want to use anything that will hurt either of them.