If Your Large Grapefruit Tree Has Tree Moss can You Remove It?
What else should I do as far as watering fertilizer type, etc. ? We just moved into this house and this tree has produced fruit, but it is small and not as good as it could be.
This article should help: https://www.gardeningknowhow.com/edible/fruits/grapefruit/growing-grapefruit.htm
There are fertilizers specifically for citrus, if you have difficulty finding one, use a well-balanced fertilizer. Always follow package directions.