Join Date: Jan 2006
Location: Burnaby, BC, Canada
They probably don't because usually people who are interested only in "cheap" are not measuring things like Potassium. As it is, very few people want the kits. Most people have pH and maybe nitrates. It's only when you get into planted tanks and SW setups that people are testing more extensively. And those hobbyists having pressurized CO2, ADA Aquasoil and running Eheim filters are probably less likely to balk at the price. For the rest of us (myself included), I just add enough and watch the plants for reaction.
Filstar pimp #59 (shhhh on the Eheim)