I recently bought a c02 kit for my tank but was shocked that I had a c02 dump within 24 hours of setting it up. I tried to save money and bought a cheap unit made in China. The company was called Ista. Luckily, I bought it from my local fish store and they gave me a full refund. However, over the last 4 days, I've had 2 Gouramis, 1 blood fin tetra and 2 mickey mouse platys die. Is it possible that the c02 dump is responsible for this? I can't say for sure that the entire tank went into my aquarium but if it did, would that kill my fish? I'm not looking to point fingers at any company. I just want to know if anyone can give me some insight about what might have happened. I've since purchased a regulator/bubble counter/diffusor from Green Leaf Aquariums. I should have done more research prior to buying bad quality equipment. They seem to be good quality. Thanks in advance for your help.