I have a 20 gallon fish tank with 6 black skirt tetras and 3 giant danios. Once I added the danios in and a bubbler the black skirt tetra started to shake multiple times over and over again. I brought my water to my local fish store and they guy who tested it said he has never seen water with such perfect readings. I have a heater in my tank set for 77 Degrees. I also have a power filter and a bubbler. I only set the tank up a week ago and used tetra safestart plus and water conditioner. Any comments will help. Thank you!
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