Honestly, with my experience with freshwater (mostly cichlids), they are very hardy. Right when I got my new tank, I put tap water in with prime, threw the cichids in, and they were all fine.
How do you know the parrot isnt doing good? If the other fish are doing good in the 125, leave the parrot in there and dont keep moving it; especially to a smaller tank. Air pump is a good investment!
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