Do you have a phosphate test kit, do you use it and do you have phosphate problems?
If you don't test for something, know it is present and know it is a problem then don't add or do anything as it may cause more problems than fix.
That being said, based on historical testing, I know I will accumulate phophates over time from feeding so I run half the recommended dose of GFO 24/7 as a preventive measure. My phosphates are now undetectable but this is based on testing not because someone said so or the LFS told me to.