Vagoma

Hi, I bought the wrong kit and only have the nitrate test not the full API spectrum of tests. according to the nitrates disappearing the plants have eaten/used them? Why do my two test differ so much? The API says somewhere between 0-5 ppm but the test strip states somewhere between 100-250mg/L. Also according to the test strips my nitrites seem to be off the charts past 10mg/L. I don't know how to convert them to be the same measurement. As far as I know I've followed the Seachem Stability bottle to build the bacteria I need.

First Time Aquarium 55Gallon: 40lbs kitty litter/4kg FLUVAL Plant & Shrimp Stratum all planted the first week Eleocharis Parvula/Limnophilia Sessilifora/Bacopa Compact/Ludwiga Palustris/Dwarf Hairgrass/Pearlweed Fluval 406 prefilter only, 6L Eheim Subtrat Pro inside Nitrates Week 1 Nitrates Week 3 Test Strip Week 3 Nitrates Test Strip Week 3 PH Pearlweed died back and starting to grow week3 Dwarf Hairgrass Week 3 growing roots Pentair Everpure 4C is the filter used for water. Eheim 200w Heater set@75 The only thing added to the tank is some algae wafers for the snails that showed up, Seachem prime/stability and Tropica specialized fertilizer. Lights are the 48" led bar that came with the kit and a Nicrew Skyled 36" This is all the info I can think to give. So did my nitrates disappear in 3 weeks? My test strips say otherwise. Is my tank ready for fish? could one of my test be tainted? When I repeat the tests the results are the same. A Digital TDS Meter Also a Digital PH Meter will arrive today. What I would like to do is be overstocked with Neon tetras and red cherry shrimp. Any advice is welcome! Also if I'm doing something wrong please let me know as well. I forgot to add that the water has never been changed

What fish can handle hard, cool, high flow water? The guy at the fish store suggested Endlers if I understood correct. Any other suggestions? I'm new to this hobby. 4 dwarf crayfish in a 30G 36x13x16 tank with Pearlweed. Aquaclear 110

I have a Everpure 4C filter for drinking water at my home. Will I still need to use a product such as a dechlorinator if my filter already takes the chlorine out? Sorry I'm new to this. https://www.amazon.ca/Everpure-EV9601-00-4C-Cartridge/dp/B0051SUPDI this is the specific filter.