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i bought an api freshwater master kit and did all the tests and they all showed what it said it should show the ph was 7.4 and ammonia and nitrite were both 0ppm, i have now put my bubble machine on full blast like blubble37 suggested and they are coming away from the top slowly, im doing a 15%...

Hi, I have a new tank and its been up and running for about two weeks now! I added my first fish ( gold zebra danios ) and they are constantly swimming close to the surface as they would normaly do when there is no oxygen in the water. I have a bubble machine and have put oxygen tablets in...