I have 16 tanks, so I have started to migrate away from methods that require me to use solutions and mixes. For pH, I use a pinpoint pH meter, for GH, I picked up a TDS meter (I know, it is not quite the same thing), and the only thing I still use a test kit for on a regular basis is the KH measurement. For that, I use the tetra kit. For out of the ordinary testing, like iron and phosphates in my planted tanks, I use seachem test kits. The easiest testing method outside of having a meter are the dip strips. I keep a bottle of those around for NO2 and NO3 testing. --C. Alan ----------------------------------------------------------------------- -- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader