Hi all,
Spirulina algal wafers and vegetables - cucumber, courgette, carrot (cooked) and melon rind. I also like lots of biofilm for them to pick at.
If you want the shrimps to colour up you need a diet rich in "carotenoids", (accessory colour pigments derived from plants and cyanobacteria.) In fish food Astaxanthin is apparently the "wonder" chemical, they use it to make farmed Salmon fillets and captive Flamingos pink. TA aquaculture sell "Red crumb" (in the UK) which is "rich in Astaxanthin", fish like it and I assume shrimps would be keen to.
cheers Darrel