Buying Fish for your aquarium can be confusing task. All you need to do is to realize what kind of fishes you need. Basically fishes can be categorized as freshwater fish and hardwater fish.

Freshwater fishes requires extra care and attention as their aquatic surroundings needs extra and quite frequent efforts to maintain neat and hygienic surviving environment.Water for fresh water fishes in the aquarium should have low nitrate levels .

Whereas hardwater fishes can survive in water where nitrate levels are high as compared to freshwater fishes.Hard water fishes can tolerate salts and minerals present in hardwater more easily as compared to freshwater fishes.

So before buying fishes for your aquarium just make sure you choose right category of fishes accoordind to the water of the fish tank.