They are very undemanding to keep except when it comes to feeding. They will only accept tiny live food such as aphids, springtails newly hatched crickets and fruitflies all f which have to be cultured in fairly large quantities.
No just the Blue ones. Sort of got into accidentally when I saw one and thought "I know exactly where that can go. I had a spare 2 foot cube tank and he lived in there amongst the plants and moist litter.