sadness

Okay guys this might be a weird question but do fish get sad when one of their tank mates dies? I noticed that, about a month ago when one of my mollies died, the other mollies in my tank were not as active for a few days. I assumed it was sickness but they didn't show any symptoms except the...

My guppies eyes look low almost as if he is sad. All he does is hangout near the filter where the water falls in. Any help would be appreciated!