Callicarpa bodinieri 'Profusion' - Beauty Berry Leaf Yellowing

I have 2 Callicarpa bodinieri 'Profusion' growing in clay pots which I only purchased last winter from Tesco. They looked fine and healthy when I bought them. After replanting them in larger pots (in April) I have fed them with Growchar and some neem cake. Since then one of them is doing well while the other one is rather poor in comparison. The colour looks yellow-ish and the leaves have green veins. It also hasn't grown as much as the second one. Both of them had exactly the same treatment, I believe. Maybe I used different potting soils, as I had several bags from different brands - not sure. The visible difference in the soil is that the yellow one has some sort of algae growing in the soil at the bottom of the trunk (since winter). I didn't remove it because I thought it might be some sort of symbiosis and it will dry off in summer, but it hasn't so far. I tested the soil PH which was 5.5.-6. Any advice on what is causing the unhealthy foliage?
Many thanks!
Many thanks!
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They like moist but freedraining soil so I would repot and incorporate a generous amount of horticultural grit into the potting mix.
They also respond well to long hot summers and sunshine ... I suspect you have them in too shady a spot so Id move them into the sunshine but don’t let the compost dry out.
Hope that helps 😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Really need a photo and more info though
I live in west central Scotland - not where that photo is...
I would take the really dead looking one out and plant it elsewhere if you've got room and keep your fingers crossed. Dig up and replant the other at least 30/40 cms away from the fence if you can. Keep it well watered - 2 watering cans full twice a week in hot weather but don't feed it anymore. The soil looks okay, don't add sand.