Achieving the Right Mix
When stocking
your aquarium you'll want to choose fish that are compatible and attractive. Here is a list of non-aggressive fish species for a freshwater tank that are hearty and attractive.
Mollies
Guppies
Swordtails
Gouramis
Silver Dollars
Tetras
Corydoras Catfish
Danios
Loaches
A wide range of goldfish varieties
The Saltwater Tank
Some advanced aquarium enthusiasts might want to try their hand at keeping a marine tank. Saltwater fish are more colorful and live longer-up to 20 years-but keeping a saltwater tank can be tricky. Here are some common marine aquarium species.
Surgeons
Basselets
Triggerfish
Angel Fish
Lionfish
Mandarins
Clownfish
Damselfish
Sea Horses
Gouramis
No matter what type of aquarium you're interested in, be sure to start slow and 
avoid overcrowding the tank or combining fish that are incompatible. Get a good book outlining the steps you need to take to achieve a safe and welcoming underwater habitat for your fish friends and asks lots of questions at the pet store. Pet store employees are often extremely knowledgeable and eager to help novice pet owners. Aquarium size, water temperature, cleanliness, plant life, substrate and, for marine tanks, salinity and pH balance are all critical components of a successful fish tank. There are few things more relaxing and rewarding, though, than sitting beside a healthy aquarium and watching its inhabitants slowly drifting by.
Fish Breeds 
Fish Species A to Z 
