I wouldn't be recommending that site. Doesn't tell you anything about compatibility, and the bioload information is also flawed. For example, I just plugged in an apistogramma and a vieja maculicauda in a 75 gallon tank just to test it out- the site told me nothing about potential problems with the two species (apisto would be eaten/killed shortly) and it claimed I was at "49% stocking level" when in actuality, a single blackbelt in a 75 would be pushing it. It also listed Tilapia Buttikoferi as suitable for a 75 gallon tank. Basically, I wouldn't use that website for anything.if you ever want to figure out what fish are compatible or whatnot, just plug tank size, fish, and filter into aqadvisor.com. It will help tremendously, comparing filtration for different fish's waste produced, stocking capacity, add up the bioload of your fish etc. I highly recommed it as it is basically a huge accessible library of information.