I need trates help here

My test kit showed everything as normal within ranges, but 2 fish died and the Nass. snails stay towards the top and don't do much, sooo...
I bought another new test kit yesterday did some basic tests, and they were quite surprising... The only problem though is the kit didn't come with the color charts like it should have, and I was not about to drive 40 miles to exchange it. Some Online searching helped for all except the Ph chart.
LFS water:
Ammonia - 0ppm
Nitrite -
Nitrate - 5.0ppm
Ph - pink colored
Salinity - 1.024
My Tank:
Ammonia - 0ppm
Nitrite - 0ppm
Nitrate - deep red, WAYYY off the chart, My best guest is 180ppm+
Ph - light purple color (Something tells me that's not good)
Salinity - 1.020
Lights are on a timer and come on twice for 3-4 hours each. (Basic Florescent sunlight bulb and 10,000 actinic)
Tank temp stays around 75-80
Algae in tank is splotchy green on glass and very little red from when I used to use tap water. (I use RO now)
 
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