I'd suggest sticking black paper or aquarium background paper on the back and sides of the tank / glass Viv .
Difficult to tell about the timing of everything here BUT its generally accepted that you should leave them for 48 hours AFTER a feed before handling them - so they can digest properly . Most say to leave them totally alone for a week or 10 days when you first get them and then try a feed ...
As I say it's difficult to see the timing of your circumstances
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