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He's in a 30 gallon tank, have 3 other smaller cichlids fish. They all get along and been around each other for 5 months I did a 20% water change this morning. Had very small trace of Nitrites & Nitrates before water change.
He may be getting picked in when your not lookingor around from the pic it doesn't look like you have much of a way to hide and claim there own territories cichlids like caves and holes the can claim as there's and get away from the other fish
That's just a small part of the tank you see, they have bridges and a lot of plants to hide. He doesn't get picked on my other Tiger is the who gets bullied sometimes.
is your tank cycled? you said you have a small trace of nitrites. your nitrites should be 0 if the tank is cycled. what is your ammonia reading? please retest all the water parameters and post.