Thanks a lot for you quick reply.
another question, one of the aquatic centres close to me sell shark fish, like ruby sharks or red tail sharks and they've kept them in tanks so I don’t think they would be able to survive in ponds but just to see if I’m right or not could any one of you please confirm it to me whether or not they will be able to live??

and also i know now im definetly getting Goldfish but could you please give me a few names for which ones to get considering on how hardy they are

Waiting for your reply

Thank you