I tested my phosphate last few days and got .25 and .29, today I tested again and got .08(tested it 2x). Is it possible to drop that quick? My guess is human error on the other 2. I use Hanna phosphate lr and I do wipe the glass before every test, maybe there was something on the tubes I was missing. My tank was a little cloudy that past few days also, I figured it was a bacterial bloom, but it is clear now.