damn! i shld hv read tis thread carefully b4 buying the nitrate test kit. i juz bot the sera one too!!!!
wedgee,
i've the same problems as u, the stupid test kit is so confusing. wif 20ml of tank water i got the lite brown color reading(the one after the yellow). i tried again using the diluted method, 10ml + 10ml, i got the yellow reading. so wat's the the nitrate level???? anyone can help???