Hoplisoma (Corys) dialing up colour patterns

GaryE

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A ways back, I picked up some freshly laid Hoplisoma panda eggs when I spotted my daughter's pandas spawning as I was getting ready to leave after a visit. She wasn't set up to raise them, so I took 9-10 eggs in a vial four hours back to my fishroom. It was an experiment - I hadn't raised any Corys for a few years and I thought that it might be good practice.
It has been.
I've had 9 young panda, about 3/4 of a centimetre in length, in a ten gallon over mixed white and brown play sand. I also have 7 young adult pandas I bought in the early winter. They are growing steadily, and are getting closer and closer to adult size, with some time to go. On a whim today, I scooped up 2 of the pale, well camouflaged babies and put them in with their wandering herd.
Maybe because of the net, the pandas immediately formed a tight defensive shoal. The 2 little ones took cover in the their new 20 gallon home. 2 adults wandered off to feed, while 5 stayed tight, but quiet. Suddenly both babies charged out and joined them.
The adults, being very cool, paid no special attention to them. But the young ones? Within seconds, the black in their panda pattern filled in very strongly. I was really focusing to see them when I realized I didn't need to. In seconds, they had taken on the same level of markings as the young adults they were running with.
Interesting communication there.
 
Connor and I didn't have a flame war! It was a misplaced post...
 
Not cory but i see this sort of behavior with cardinals where i will add new ones (for example) and they will go pale but if i already have a school they will immediately jump in the school and quickly brighten up in a matter of seconds so you can no longer tell which are the new ones. When i don't have existing cardinals the new ones usually stay pale for quite a bit of time and stay out of sight - not days but definitely hours and sometime into the next day.
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I could tell you the story of not seeing my green neon tetras for over a year and i would add a few more every 3 or so months thinking they had died and then one day i discovered none of died and now i have way too many green neon tetra.
 

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