I am running a 75g community aquarium consisting of Roseline Sharks, Celestial Pearl Danios, Neon Green Tetra, otocinclus, kuhli loaches, and forktail rainbowfish. I am in the process of adding fish that are on the $$$$$$ side of the spectrum. When looking at fish, water quality and parameters are all over the place depending on where you look on the internet. My question, is there a reliable site, or a favorite site by the forum, that I can use to make sure I am not purchasing fish that will thrive/or not, due to pre- existing water parameters. I would hate to put a fish into a hopeless situaion.