My guys like floating and sinking, so a mix of the two would be good for them. Don't forget to add a bit of veg now and then, such as chopped frozen peas or veggie flakes. I feed all my fish a bit of veg. It's healthy for the digestion.
I've only ever used sinking pellets by NLS, but you can't go wrong with any NLS pellets.
There are also foods made specifically with colour in mind, so you could try some of those.