Don't expect quick fixes. When I developed a similar problem, I purchased my own RO/DI filter (you need one anyway if you're planning to be in the hobby long), started weekly 20% water changes, cut feeding drastically (no flake food), upgraded to a better skimmer, added a fuge with cheato, and increased my SB depth.
I'm slowly winning but have been at it for about 2 months now. It brought PO4 to zero and Nitrates to 2.5. I'm winning but slowly. You can too but don't get discouraged, it does take time. Good Luck!
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