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Right, they look a little pale to me.
You need to put some substrate like gravel and some decorations like a driftwood or round rocks in there.

I agree, also try feeding them rich foods such as beefheart, krill, shrimp, fish fillets and bloodworms which will also bring out the colour in them, as well as being very healthy too. All of my Pygocentrus species (Nattereri, Caribe and Piraya) used to have lighter colours when not living long term in a decorated or substrated tank, try these changes and see the difference.
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