Hagen and Tetra are both bargain test kits, in my opinion I wouldn't use either. I rather liked SeaChem test kits and there are other premium kits out there but Salifert has my vote as I said before. What are you using to test S.G.? Make sure if it's a plastic one with the arm that floats that there are no micro bubbles attatched to the arm, rinse it well in fresh water before you test S.G. (in my opinion) and DO NOT make sudden changes in salinity or pH, even reducing bad stuff to quickly can be bad. The old saying, doing something is better than doing nothing isn't always the best approach, first off you have to know if your test kits are accurate, one way to test for ammonia is to add a drop or two of ammonia to a mixing bowl of water then test and make sure your kit shows the ammonia... just an idea.
Doug
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