Wanting to know everybody's opinion on the best test kits out there on the market today ( KH, Cal, Mag, etc.)I have been using Salifert for sometime now, but finding that their quality has gone way down and looking for a replacement brand. I am seeing a new brand - Elos? haven't done a lot of research, but the little I have seen says there are quickly becoming the best out there, anybody have experience with this brand?