new to the hobby. working on lower my ammonia level. was at 4.0, 2 water changes later and it was down to aroun .5ppm today i went to buy a nitrite/nitrate test and they didn't have any of the liquid tests, so i had to get a test strip kit (it was closing time on sunday, not a lot of other options). I know that these are know to be inaccurate, but i at least wanted an idea of what is going on. these are the results (also see picture below) Nitrate: 20-40 Nitrite: 3 pH: about 7.0 KH: ? maybe between 40-80, strip came out weird GH: 180 this is a 10gal tank that is currently housing 6 neons and 1 otocinclus (it previously also housed 1 betta and 2 zebra danios, the betta and 1 danio died; 1 danio just rehomed). the nitrate and nitrite is too high, right? what can i do to fix this problem?