Think about this now; If you turf your tennants out, how long will it take to find another tennant?
If you have a good tennant ,why not cut some slack?
The alternative is to find another one,who may not pay you what you are presently getting ,you may find tennants are looking for a reduction in rental prices anyway.
You may find that the new ones are not as good and it may take some time to find another one in the current climate.
You may also find that its not that easy anymore to let,and what would you would end up doing is cutting your nose off to save your face.
If it were me and I had a choice of keeping a good tennant at a reduced cost or gambling on ,having no tennant/bad tennant/left waiting to get a tennant ,I know which I would choose to do.Its your call though.