Hi, all. New here. Had a 20 gallon years ago, sold it when I moved. Kids wanted another aquarium, which brings me to the question. I have a 30 gallon tank. Bought used, jumpstarted with filter from seller, cycled 2 weeks empty. Ammonia dropped to 0, added 6 tiger barbs. Shortly after, added 2 kissing gourami. The barbs were my idea, the gourami were my daughters. Simply because they're "kissing" and she's six. My son has his heart set on a crayfish. He'd be content with one from the creek behind the park, but I'm looking at options. Have not made a decision what type yet. Maybe one from the creek! All plants are plastic. Temp is 78F, PH 7.6, Ammonia 0, nitrite/nitrate unknown (gotta buy the API master test kit) What would be good fish to add, considering the potential for a crayfish? The gourami are decent size (3" or so right now), the barbs are smaller (1") but schooled up and feisty. I don't want to add something just to have it eaten by the crayfish. I'd considered large tetras, but not sure I want to add a second schooling fish. It will be another month at least before anything else is added.