06-20-2014, 05:22 PM
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Ah, occasionally this happens. Endlers are pretty peaceful, but they will sometimes pester males of other types until they leave. Sometimes they will nip if they have a fungal infection coming on, they'll bite it off making it hard for you to even see anything(I had this happen once! I moved the fish to a tank alone and a few days later saw why they were picking on her when the fuzz popped up in the areas she was being nipped...although it's also entirely possible the fungus happened BECAUSE they chewed up her slime coat I suppose).
Anyways, if you don't have a bunch of hiding, get them some. May lessen the stress and make it harder for them to bully each other. I love having java moss around, they get in there and hide.
If they don't leave him be, you may want to remove the bullies, not him, temporarily. They aren't exactly territorial fish, but like any fish they can become so randomly. Removing them for a short time makes them think they've been dropped into someone else's territory and they shouldn't bug. If they do, you may want to find him a new home.