I find these often and i have never kept them before. I collected a few today because i thought they would look interesting i an aquarium. Any tips on raising them?
Lucky you! I wish I can find that many diving beetles in my area.
They should feed on live crickets, worms, fish food, frozen bloodworms, etc.
I believe this species will lay their eggs in Java moss just like their relatives. L1 larvae will be tiny so you should provied some small bloodworms, or provide newly hatched mosquito larvae.