Aquarium Keeper contains six databases, all but one (test kits & medications) are linked in some manner. Together, these databases allow you to: catalog your fish and plants, describe each of your aquariums in detail (including your hard goods), what fish and plants reside in a particular aquarium, illnesses you have treated (including which fish had the illness), detailed water test and aquarium maintenance results and a database containing pertinent information regarding the test kits and medications you use or keep on hand.
Water quality test results (pH, Carbonate, Salinity etc.)
I designed this database because I could find no others like it out there. I did find desktop versions of databases for aquarium keepers, but how easy is it to drag your computer over to your aquariums? One of the main deciding factors for obtaining a PDA (I have an iPaq 3670) was that I could take it with me anywhere... in particular, to my aquariums where I record water test results, illness treatments etc.. Until now, I have kept a hardcopy booklet containing this information, but its organization leaved something to be desired (I am usually an extremely organized individual).
For the Aquarium Keeper: http://www.akasa.bc.ca/xandria/a_goldfish/aquariumkeeper.html