Need Help With Interesting Looking Insect!

[Mantis Man13]

I found this insect, I think it is an assassin bug. Please confirm. I have tried feeding it tiny insects but it just isnt interested in anyhting. I have had it for 4 days and it will die if it doesnt eat something. Please help I want to keep it as a pet!

 

[Mantis Man13]

 

[Salmonsaladsandwich]

Not an assassin bug, but a coreid bug nymph. These are typically herbivorous.