Answer by  
                                                                                          sdblack99 (329)
                                                            
                          
                          
                                                          Goldfish prefer a fairly neutral pH level, some say about 7. 5 is ideal. That being said I've seen them in all types of conditions andIi would think that anywhere around 7 is fine. They wont like seriously basic conditions like a cichlid would (around 8. 3), or anything too acidic (like low 6's)