I have naturally gotten some in tanks... i had an empty jar sitting with some old tank water and when i went to clean it out i noticed a sizable population had grown... so i filled several jars with that and new fresh water, added in some sponges and set them in a sunny window to grow some algae and to allow the populations to grow in them.yeah. Well, it works
How hard is it to grow a copepod culture? When I was raising guppies I just feed flake food.