What signs indicate good water quality for tropical fish?

Question

What are the signs of good water quality?

I want to add fish to my freshwater aquarium, and I want to make sure they have the least chance of dying.

Answer 1

• Check your water parameters, it should have 0 ammonia, 0 nitrite. Some nitrate presence is not lethal as long as it's within the limit.
• Match the pH and temperature depending on the species you plan to put it.
• Water should not be cloudy.
• There should not be any bio-film forming on top of the aquarium. In case it forms, increase surface agitation.
• Make sure your tank has enough filtration to support the bio-load.
• Tank decoration should match the requirement of the species. Some prefer less open area and more hiding place, some prefer the opposite. Some prefer plants, some prefer rock, some prefer a piece of wood.

Answer 2

Some signs of good water quality:

• The normal pH levels of 6.5-7.5;

• The normal temperature of around 25 degrees Celsius;

• no ammonia, nitrite or nitrates present;

• algae present in small, controlled quantities.