I bought 3 male guppies 5 days ago and I have noticed flashing on rocks and plants. One of the males top fin has been changing colour and turns black also I have noticed a more whiter edge to his tail. Another red guppy’s tail has developed a more blackish edge and the third guppy has developed a blue dot on both sides, this almost looks like a dot of blue ink along with a whitish top fin. I have heard guppies can change colouration when stressed I’m not sure if this is true or not. The tank was set up for 48 hours before adding fish and they were acclimated correctly for around 30 minutes. They are nipping at each other like male guppies do, one of the males has had his tail nipped yesterday which has unfortunately caused a split. I am hoping this doesn’t turn into finrot. I have been carrying out water changes the first 20% after the fish had settled for 48 hours, added filter boost, stress coat tap safe, along with evolution aqua pure aquarium that aims to break down ammonia and nitrates. Due to the flashing continuing I carried out a 50% water change yesterday still adding stress coat. They are currently in a 5 gallon tank (19 litres) with a heater, filter, air pump, and live plants. Any help is appreciated! Thank you.
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