Newbie here with some questions about my cycling tank

[Sumfingwong]

He told me I can use Damsels, and I have read where people can use them. They seem happy, and not stressed.. they are super blue right now. If I see any signs of stress, I will return them. However, this weekend.. my 2 buddies are doing a water change, and they said they will drop some buckets off at my house when they are done. Both tanks have been running for 2+ years. Would it be a good idea to use their water?

Thanks for all the help