Odd behaviour!

macattack

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I am new to tropical fish tanks and have had a 60 litre (ish ) for the last 3 months.
I have matured it slowly and added the fish even slower. The question I have is regarding one of my 4 Tiger Barbs - it appears fat and is swimming constantly with its head facing the bottom of the tank. Is this normal? Or is pregnancy the answer?
Having read some of the other entries - I too have a Tiger Barb who seems to want to be green instead of black - but again there is nothing wrong.
 

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