Problem bringing up PO4

I use TSP in my ATO but I have a 1000l container for that as I travel away quite a bit. If I don’t or if it runs out I immediately notice algae stops growing in the glass and my corals begin to pale and decline.
 
Update:

Hello guys, well, after 3 weeks of dosing regularly TSP and a cup full of frozen foods+nori+reefbooster 3x a week the colors are better than ever, my CAPs have that intense red and all acroporas are full of colors, I can say the TSP really helped the corals to regain their intensity on the colors.

I couldn't get the phosphates higher than 0.03, but I believe the value is fine if the colors are back, I didn't want to rise them any higher than that also, I tried dosing this amout of tsp, the colors came back and I am happy, so no need to rise them more.
NO3 are stuck at 5ppm and I think I can maintain these 2 parameters like this forever since it's been 3 long weeks and no changes on the PO4/NO3.

I will try to upload some before and after pictures.


Thank you guys for all the help.
 

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