Goldfish and PH

[jenricae]

I'm just curious about PH. People are telling me that PH doesn't matter so much as stability of PH. I've read that GF need 7+ PH and Alkaline waters. What happens if you keep GF in soft, low PH water (ph 6)?

 

[anshuman]

Low pH
Acidic conditions result with a low pH, and can be caused by an excess of fish waste in the tank water. Acidic water can weaken your fish. A goldfish in an acidic tank will display some of the following symptoms.​

• anorexia
• excess slime
• isolation, fish resting on the bottom of tank
• blood streaking in the fins
• death

High pH
Alkaline conditions occur when the pH is too high. When the pH level are high ammonia can become more toxic. A goldfish in an alkaline tank will display some of the following symptoms.

• excess slime
• gasp at the surface
• death

Goldfish Water Quality and Treatment Information from Desktop Goldfish

 

[Newman]

like anshu basically said, Its advisable to keep goldfish in a pH of 7 or above. they will be healthiest that way.
If your water has a pH thats lower, but is stable, then you should just go with another fish species...