Instruct: Classify a given review into positive or negative sentiment.
Query: I can't believe that actually worked!

I've just started raising bettas, and up til now, I've only been feeding with microworms because I was a little intimidated by how much upkeep baby brine shrimp need. And what a pain it is to harvest them. But, ha ha ha ha, it is so very simple now. I was surprised to see the BBS eggs hatch within seventeen hours and willingly swim out of their protective hatchery into the mouths of my greedy betta warriors. However, I am having an issue with the hatchery. You really have to make sure that the water is actually at the water level labeled on the hatchery. It's making changing the water a bit more challenging, because if the water level drops or rises too much, salt water flows out of the hatchery. Ah well. I'd say it's worth it.