To be honest, you're at it. I speak as someone who makes a living writing about oddball fish -- if I want to find out about some obscure species, I use the Search tool and go back through the TFF archives. There are some seriously talented aquarists here with very catholic tastes in fish!
Obviously Fishbase is the other place to visit, but since it's primarily about wild fish and aimed at scientists, it's value for aquarists is somewhat narrow in scope.
Cheers, Neale