Eye color in New World Cichlids

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fishguy1978

Potamotrygon
MFK Member
Mar 30, 2020
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Washington
Knowing that it can be a determining factor in correctly identifying a species. I have angels, Heros Efaciatus, Liberifer and Notatus, and Hypselecara Temporalis and Herotilapia Multispinosa.
1. Why do many South and Central American cichlids have red eyes?
2. When does the eye color change in those species that have red eyes as adults?
3. What determines whether or not eye color will change?
4. My H. Multispinosa are a mixed bag where 2 have yellow and 2 have red. Is this a male/female distinctive? Each of the 2 yellow eyed have paired with a red eyed and produced spawn. I'm not sure which is male/female in these pairs.
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