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Which one and why? Looking to order tonight or tomorrow to test before I set up my new tank.
The 713 if you get 0.00 on it your in no worries. Really anything below 0.0 is just fine. Don't think that you will be unhappy with the 713 because it is the one for phosphate. Also phosphorus and phosphate are not he same. It's about the only tester I would use from them. At least what the reviews have said
I use salifert for all other tests and have been happy with them.
Anyone know what an average price is for a clam