Molly Getting Picked On And White Something On Him!

[GouramiGirl87]

I have a single black molly and five platys. At first the molly was VERY aggressive at feeding time and picked on the platys. Well now he is still aggressive with food, but now the platys are picking on him. He also has something white on him. Looks like maybe scar tissue??
I cant bear to get rid of him, can he survive in a unheated tank or bowl? Or should I try to find a home for him??

 

[WILDER]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate and ph.

The white on the fish where is it on the fish, does it look fluffy or bleached out.

 

[LauraFrog]

Mollies need a ten gal tank at the very least, they are active fish and grow large with proper care. Getting some female mollies might help - he'd be more interested in them than annoying the platies and the platies might leave him alone.