Ruby Red Grapefruit Tree Producing Bad Fruit?

I live in Florida and have a ruby red grapefruit tree in our back yard that used to produce a lot of wonderful tasting fruit. I moved out for a year and a half to go to a school out of town; during that time we had a renter living here. I just moved back in a few weeks ago and notice the tree is only producing... show more I live in Florida and have a ruby red grapefruit tree in our back yard that used to produce a lot of wonderful tasting fruit. I moved out for a year and a half to go to a school out of town; during that time we had a renter living here. I just moved back in a few weeks ago and notice the tree is only producing about five grapefruits that are disgusting. They are no longer getting pink on the inside either. I was wondering what I can do to start to correct this problem.
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