Makes sense to me Bob. Some time back I started a topic on room temperature vs tank temperature, using my rack of 5 gallon tanks. I've got the same rack of 5's open for the summer. Man are DO meters crazy expensive! I did find a liquid DO test online, I've got plenty of Prime on hand, time for a bit of playing around!
If you want to start another thread on Prime and chems perhaps that would be better.
You assertion that I had not answered you question on how much was an overdose was in fact answered by only adding prime for to treat the free ammonia per the seachem multitest.
Anything over that is not effective and will only lock up more oxygen.
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