what does it mean when zebra danio gills are slightly pink?

your ammonia levels are starting to climb, do a water change and this will help lower the ammonia level.
 
gills have blood in them if the pinknis looks like inflamation you might have a fungus ucan get tabs for the water
 
gills have blood in them if the pinknis looks like inflamation you might have a fungus ucan get tabs for the water
 
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