Since you mentioned that the one fish is a Betta, it could be possible that the fish has gotten stressed out with the addition of a new fish and this can cause Betta fish to change colors.
Source-http://pets.thenest.com/bettas-change-color-4520.html


Since you mentioned that the one fish is a Betta, it could be possible that the fish has gotten stressed out with the addition of a new fish and this can cause Betta fish to change colors.
Source-http://pets.thenest.com/bettas-change-color-4520.html

Hi thanks for your reply. Interestingly, my yellow guggy's tail is turning red too. Niw the body also strats to have red patches.

Hi Justkeepswimming
just for information. The colour of my betta fish is red.

please share a photo of your fish, either your fishes are colouring up or they are sick.
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