06-04-2012, 09:41 AM
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There are a few questions that come to mind when I read your question. . .
First is; How many guppies do you have, and do you know how many male guppies you have vs female guppies? And what are the genders of the fish that is causing the problem, and those that are being picked on? If you aren't sure, a picture would help me figure out what you have exactly. . .
Second, how long has your tank been set up, and how long have these particular fish been living there? Can you post your water parameters, in case this is an issue with the water?
Third, What types of ornaments do you have (again, a picture of the tank might really help) - do you have any plants? What I'm trying to figure out is if the guppies are out in the open, or if they have plenty of hiding places. If they don't have a place to retreat, they'll be stressed - and the 'victim' won't have anywhere to go to escape the 'bully.'