Q.Spider plant
My spider plant seemed to be doing very well then some brown spots started to appear. I attached a photo. When do I fertilize it? When do I transplant it and what do I do with all the babies? I only water it when it is dry and use only distilled water.
Your plant actually looks very healthy.
These links will refresh you on the care requirements.
https://www.gardeningknowhow.com/houseplants/spider-plant/spider-plant-care-gardening-tips-for-spider-plants.htm
https://www.gardeningknowhow.com/houseplants/spider-plant/fertilize-spider-plants.htm