is thier something wrong with my cardinal tetras??
I got 5 cardinal tetras two days ago and I have noticed that, at night thier red strip is almost gone and their 'blue strip' turns purple..
Is their something wrong? Or will this pass when they get older?
Thanks for help 
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46 Gallon- 5 Glowlight Tetras, 5 Cardinal Tetras, 3 Zebra Loach, 4 Bronze Cory, 3 Ottocinclus, 1 Red-Tailed Black-shark, 1 Bristlenose Ancistrus, 2 Kribensis, 4 Golden Wonder Panchax, 2 River Shrimp.
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