Purple Leaves Phosphorus

[Guavatone]

These are German pinks with potato leaves. Can I get some help diagnosing.

I just Fertilized with Kellogg Kelp/Fish liquid last week and it didn't seem to do much.

The soil is a combo of Kellogg Organic soil bags with original container soil and peat, lime, worm castings, espoma garden fert, Dr Earth Tomato and Herbs fertilizer. I did a compost tea of the listed fertilizers a month ago.

Here's the pics. I already pruned one leaf that was much worse.