Not only can fish be tasty, it also delivers a super-key nutrient your body needs — protein. “Protein is a building block of every cell in your body,” says Marisa Moore, M.B.A., R.D.N., LD., ...

Credit: Getty Images Goldfish thrive in water with a pH range between 7.0 and 8.4. Maintaining this stable pH is important. Fluctuations can stress your fish, especially if sudden, and increase ...