discus weird movements

[gian krlo]

sometimes i see my discus move extremely fast their lateral finns while swiming slowly and moving the head to the side of the moving finn.

Or the sometimes swin fast and then slow ending with the caudal finn moving like if it is itching or something to the fish
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WHY IS THIS??? MORE WATER CHANGES????:

 

[WyldFya]

Sounds like they are doing a mating dance.