Hi,IMO the test strips aren't very accurate, and i personally won't use them.
why are you using dionized water for water changes? i assume that's what you mean by DI? Not needed. if your tap water is safe to drink and you are using Prime dechlorinator, then just use tap water.
Thank you for the input. I read somewhere that DI water would help with water quality. But I much prefer using treated tap water. Thanks for the tip!
Randy