i have a test kit, ammonia, nitrates, and nitrites are all 0, ph is 6.5.
i also know the tank is overstocked, i had 4 cardinals in my 5g tank but three were too small when i got them from the pet store and died within days, so i moved the last one to my bigger tank. also, everyone including the dojo is small and i have 15g of filter in a 10g tank.