where to get water tested in huntsville

i need to find a place to get my water tested in huntsville, im afraid my test kit has gone bad but im not sure im reading 5ppm on nitrate but have had two fish die in the last 2 days when i went to bed they were swimming around fine but when i woke up they were dead
 
Check your temperature, too. The fan on my tank has sure been kicking on the past few days.

Dying overnight may be lack of oxygen -- warmer water has less dissolved oxygen. this shouldn't be an issue if you are running a skimmer or overflow, but if you aren't you may want to review your surface agitation.
 
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