How do Zebra Danios Mate? Do they change color?


First off, two of my Zebra Danio's have turned a yellow-gold color. They've been "yellow" for 2 days now, they're eating a look good, its even kind of pretty, but I want to know if this is normal?
Also, two of them keep circling eachother under this one plant over and over.....Friends or friends with benefits??


how was the tank cycled so fast after a week old? have you tested your ammonia/nitrites recently ? although I have no danios, not sure if turning yellow is common..maybe some danio members will have better advice with that....but fish can change colors/attitudes with ammonia issues...
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