Might be a dumb question....

[TimT]

Originally Posted by toytech

They would have to at least be members of the same species to come close

There have been lots of hybrid fish but only within the same genus. ie Dwarf angel with Dwarf angel and also some tangs. Scopas with Yellow and Powder Grey with Achilles.

[Madreefer]

https://www.youtube.com/watch?v=pkg7DPcMZ-s

[George]

The last few levels of classifications of living things are:
Family
Genus
Species

I have been following hybrid fish for a long time now. From what I read, only fish that are in the same genus have a possibility of hybridizing.
For example, lemonpeel angelfish, it is in:
Family: Pomacanthidae
Genus: Centropyge
Species: flavissima
It can hybrid with a a few of species under the same Genus, like C. eibli and C. vrolikii.

Both flame angelfish and emporor angelfish are in the same family, Pomacanthidae, but they are not hybridizing.
HTH