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Nice fish
If I can find pics. of mine as a juvi and you don't mind a hijacking I'll add my pics as well,I'm at about the same stage as you in the color change.
Do you have a heater or power heads in the main tank?
If so you might want to get a grounding probe this will take care of most if not all of the stray electric current in your tank.The stray voltage can cause this at a very rapid pace.
You can contact ETSS directly and talk to Gary,he sells the glue they use to build them or if your close enough he's in Beacon NY you could take it to him and they would fix it.Nice shop to take a tour of.