help with my high phos!

my phos. just keep climbing. they are at .31 now. can someone tell me what the cause is and how to bring it down? many thanks!
How old is the aquarium?

How long has the phosphate been increasing? What did it start out at?
 
You could lower it with gfo. If you choose that route use about half the recommended amount starting as it strips PO4 pretty quickly. I mix a few spoons of gfo in with my carbon when I change it out. I mainly do it just to keep mine from climbing much higher than it is which is 0.3. This is my oldest tank. Still high by many peoples standards but coral are happy so I roll with it.
 

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