Thank you Debbie (as always). One thing with Basil is you can give it too much "goodness". The less good stuff in the soil the better, which might be your problem.
Also, get a moisture stick to make sure you are giving it the right amount of water.
Unfortunately, I have a cat that will eat every plant in my house, so I am unable to grow ANYTHING indoors. I could strangle Gabrielle, but instead opt to grow outdoors so I can keep some sanity!