I have a basil plant that is turning a goldfish color with tiny black spots. The leaves eventually brown and wilt. It is an indoor potted plant with several plants in the same pot. I've looked at different forums but have found anything that helps. From what I've read, it sounds like I would one just have one plant in the lot, however I've had it potted this way for over a year and the plant has only just recently developed this problem. Again I have not come across anything that talks about basil leaves turning a goldfish color. I'm sure I'm doing something wrong but not sure what. I've attached a pic to show what the leaves look like.

Thanks!