Yes indeed they are quite adorable and very common in my area
They will in fact eat each other so i recommend keeping them separate. Although I have never given them a chance to try it. When breeding them supervise them and separate them if you are going to leave them. Adults will eat crushed crickets and do show interest in citrus slices.
I have some ground grubs right now I will post pictures, the grubs are also predatory very similar behavior to "Scarites subterraneus Fabricius" . They do well on crushed crickets. But love to eat asp moth Caterpillars. ON cannibalization the grubs will each each other with out remorse or regret. Separate them as so as u see them there grubs are alot like Alaus oculatus grubs in that regard very easy to keep one per glass container as they can chew threw any plastic one. Once the female has laid eggs it will take about 3-5 weeks for them to hatch they are TINY and thin like half of a grain of rice. Adding food will reduce cannibalization but separation is the key.
A collection note .... It is common for some ground beetle also have a mildly burning acid substance they secret when they are threatened . This will burn you hands if it is not washed off quickly. When collecting them bring some water to wash it off that instant alcohol based hand sanitizer works well also. Some people don't react to it but I sure do LOL ! I wear glove to pick up all ground beetles.
I keep almost all my bug in high humidity and it seem to do them all quite well . Even my arid bugs enjoy and thrive in better than if kept dry.
Most of my bugs have plants with them I keep the ground beetles with wandering purple hearts "Setcreasea pallida". The plants require little light keep the humidity up.
They love to dig so give them ample space and females will avidly lay eggs if you add frase from a rhino beetle grub or a scarab grub.
hope that helps
