check out the hump my devil just grew

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nice looking devil... probably a really really dumb question... but what causes them to grow the humps? i have a 8" flowerhorn that doesn't have a hump at all, and probably 90% of all the flowerhorns that i see do... what causes it?
 
from what iv read its a sign of dominance, or aggression.
 
Gorgeous!
 
midtae thats the same guy. crisper id say hes about 12" a lil over 2 years old now.
 
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