hello all. ive been using the api master test kit for a month now and am not sure how much i can trust it at this point. ive been reading 0.25 ppm ammonia, 0 ppm nitrite and my nitrate just tested at 10 ppm. i am doing a water change either tonight or tomorrow so that should lower the nitrate. ive been doing weekly 50% water changes to help keep all of the levels as low as possible. one of my hermit crabs just died and i am wondering if all of my levels are actually higher than what the test kit is telling me. any help or recommendations are appreciated. if im doing something wrong please let me know as well since im fairly new to this hobby. thanks.