Is there a site so you could see if your tank is overcrowded You would type in the measurements of your tank then choose what fish you would want in your tank.?

I can answer your question without you having to search and search. The good rule of thumb for freshwater is one inch of fish for every one gallon, but goldfish and saltwater are different. Goldfish need 3 gallons of water to every inch of fish, same goes for saltwater.