Question

[HarlemsYandel]

I Have two of these yellow belly's and I've noticed one of them has been distancing itself from the other fish like by my wave marker or in the corner of the tank and it never wants the fish next to it can U guys help me by telling me the reason why hey do this and what I should do to help them out just incase they are stressed

And also they r usually a royal blue color but I think when they get stress or something the blue turns black as U can see Plz help

 

[GreatWhiteTang]

Need more info.. Tank size.. Water parameters..

 

[HarlemsYandel]

75 g I gotta get all water tested again