Quick Update
I took back 2 of the 4 CPDs that were left, as they didn't look right and were at the surface constantly.
The other two (male and female below) seem in much better shape, so I kept those.
Sorry for the bad pictures, they're a pain to photograph.
Female
Male
So while I was in there, I explained the situation and they were happy to take the 2 fish back.
I had a look at the CPDs they had there and there were a dozen or so that looked pretty healthy. I didn't want to just have the 2 CPDs, so I thought I would take the healthy ones and give it another go.
The top 5 were popped in a bag so I was expecting to pay for the extra 3, but no, the owner was kind enough not to charge for them.
So all I paid for was the frozen food they like. Fingers crossed tings will improve with this batch.
Small gestures like that go a long way with me, I'll certainly be back...even if they do have some sub-standard fish.
They're even tricky to photograph in a bag!
You can hopefully still see that they have a better shape and overall health. Admittedly, when I bought the first batch, it was on a sunny Sunday and the shop was extremely busy. Don't think I even saw them until I got home.
They're in the tank and we'll see how feeding goes later.