I had an aphid problem earlier when you plants were younger. My habanero, jalapeno and tabasco lost almost of their leaves. I thought they were dead. I hit them with 1/2 strength 15-30-15 once a week and they are now about 12" tall and healthy. Depending on how big they are, I would hit them with a diluted fertilizer, such as fish/seaweed emulsion. I'm sure there will be more experienced people that will provide better insight as I am a newbe. What worked for me doesn't mean it will work for you. If you plants are not looking the best, it can't hurt to give them a little jolt. You may also want to re-pot and put them in some fresh soil.