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  1. #1
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    Four clownfish, biggest three very aggressive to smallest

    I have a 250L tank with four clownfish, and then a bunch of others in my cleanup crew. The biggest three clownfish have been constantly aggressive to the smallest one - at first I thought it was just typical dominance/submissive behaviour but it has been going on for over a month now, and the level of aggression is very high.

    I bought the tank off a guy in January already set up - the two largest fish were bought as a pair around 2 years ago, and the smallest were bought as a pair around 5/6 months ago. The two largest had already been established as a male/female couple, and the smallest seemed to be hanging around each other when I bought the tank but it was uncertain as to whether gender had already been established.

    Now, of the smallest two, one has grown a fair bit larger than the other and is hanging around the largest two, who constantly bully the smallest. The smallest one doesn't even try to fight back, he just swims very quickly away and occasionally does the seisure-submission thing, but mostly swims away with the others chasing him. I am worried that the smallest one may not be a he and is instead a she, and now that I have the tank and the other small one has split off from the pair she is being bullied - could this be possible? I would have thought that 250L would be enough for them to leave each other alone but this is not the case. Why do you guys think it is being bullied and how can I help? The small guy is looking very tattered - its anal fin has been ripped to shreds, and its caudal fin has a couple chunks taken out of it, and the fish in general is looking quite gaunt. I feed the fish one cube of brine shrimp daily, which I would have thought is more than enough to not have food as the problem causing aggression but maybe it isn't?

    Another question - I have a flowerpot coral that the largest fish were hosting constantly, which I read is not too good for flowerpots and mine wasn't even putting out its 'flowers' most of the time, instead staying closed up. I made a cage out of plastic mesh and put it around the flowerpot in the hope that the fish would leave it alone and move onto the bubble-tipped anemone in my tank, but they have not and any time that I remove the cage they instantly come back to hosting the flowerpot. I've had the cage for around a month now and have tried to remove it a couple times to no avail. What do you think I should do? I've attached a picture of my tank and I will post a video of the aggression in a bit.

    My parameters are: KH: 10.2/3.6, Mg: 1200, Ca: 385, NO3: 5, PO4: 0.25: PH: 8.2, Ammonia and Nitrites are 0
    Attached Thumbnails Attached Thumbnails anemone-1.jpg   smallest-clownfish.jpg   flowerpot-coral.jpg   entire-tank.jpg  

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