Ok, so I've been testing water on a reef tank that has been solid red on API Nitrate (160ppm - max) and hot pink on Salifert (100ppm - max). I did a 15% PWC
yesterday and cleaned the sump. Still at 160ppm today.
I have 20g mixed SW
@ 74-75F that has been sitting there now for about 18 hours in a 25g Rubbermaid tub I bought at Menards and rinsed well before mixing. I bought the water at Wal-Mart and the grocery store, Culligan filtered & RO
I tested it last night (5 pm ish) before adding salt, 0 ppm
Nitrate (freshwater at the time). Salt was put in about 8am ish. Now it shows 15-20ppm on the SW
scale at 2pm ish.
So #1 item in this post:
Does anyone know if Rubbermaid tubs will leech Nitrates into RO
filtered water if you let it sit in the tub too long? Ish!!
#2 item in this post: LFS / WTF
I cut the tank water and mixed water 50-50 in a test tube and tested that to see if I could get a more accurate reading and double it to come up with the level in the tank. Solid Red by the time I got done shaking it.
So I took samples of tank & tub to my LFS
and this is what happened; they also used API and put the 10 drops of the first in, holding the bottle SIDEWAYS, finger on top (not the cap) and shook it. I asked him if it made a difference since the instructions say hold the bottle vertical. He said NO. Then he grabbed the #2 bottle, without shaking it AT ALL, and did the SAME THING. Then he shook it for about 15 seconds. The tub water came up 0 and the tank water came up about 40-80. I asked him why he didn't shake up the #2 bottle like you're supposed to, and he said they get used all the time so they only shake them every once in a while, and that the suspension stays dissolved enough since they use them so much. Hence, WTF.
So, I'm doing it right, aren't I??? If you squeeze the drops with the bottle sideways, you're going to get smaller drops or non-symmetrical size, and by not shaking the #2 bottle, you're going to get variable results depending on when it was shaken last. Aren't you? I was just floored.