Male G.semifasciatus killed female....

griseum

New member
There had been an increase in aggression from the male towards the female over the last week or two. The female was spending less and less time in the water column and more time laying on the tank bottom against a corner, or between LR. Finally, two nights ago, I found her dead, with some fin damage and other little indicators of more aggression.
The tank the pair was in hadn't seen any changes or new fish in months. Everything stayed the same, except maybe the addition of 30 pounds of dry rock a few weeks ago.

The loss hurt. I got that stinging sensation when i came down and saw her in that oh too familiar pose, with gills flaired, and rigid.

My concern now is for the Male G. semifasciatus. He is healthy, swimming, eating (as was she) but of course different without another Geni angel in the tank. From what Ive read, and seen, He will lose his vibrance and the beautiful male coloration and pattern.
I have a Bellus Juvenile/female that is about half of his size. If she was bigger, id have no problem just adding her to that tank hoping the male keeps his colors. But the bellus wouldn't make it half as long as the Semi female did.
Two other options are available. When I get a chance to find a female of a Genicanthus species thats larger, I will purchase and quarantine her, then add it, whether it be watanabei, lamarck, bellus, melanospilos etc.
Or:
I add him to a Larger 6foot tank by himself with the smaller bellus, giving plenty of room for the smaller to escape.
Or:
I add the Male Semifasciatus to the 12'x12' shark pond. Then add a similar sized female.

Thanks guys.
 
just curious what size tank is the male in right now? that seems to be a lot of agreession from the semifasciatus between the two sexes.
 
He's in a 4x2 foot tank. The aggression was relentless. At some point she seemed to have just give up. I initially QTed and observed in a 6x2 foot tank.
 
Groups of geni's

Groups of geni's

I use the haremic nature of genicanthus to diffuse aggression in my tank. I would go with adding the male and the bellus to the 6x2 but would also add one or two additional females either melanospilos, lamarck or another bellus or more semifasciatus if you can find them. Newly shipped watanabeis are not nearly as hardy as the others unless you find a large 4" female that has been in captivity a while. This should diffuse the aggression between 3-4 females and allow them to not be chased all the time. I have not had a semifasciatus but I have seen a number of reports of the males becoming very aggressive similar to yours when only a pair is present in a small(<6ft) tank.
 
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