well, while we're on the topic...
i would like to know if i need to buy a kh kit. i will have my co2 tank (10 lb pressurised) set up soon. so i'll definately need a ph kit.
i have read that kits lose their effectiveness over time (as they age). my lfs can test my kh for me. so, rather than buy a kh test kit would it not make more sense just to test for kh at the lfs, say immediately before adding co2, and then perhaps in a week, and then maybe sporadically thereafter? as long as i don't change substrates, and my water source for changes is identical, would the kh likely fluctuate?
thanks in advance.