Sysnpilum aggression and compatibility

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Plecostomus
MFK Member
Oct 8, 2009
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Gold Coast
Over the last few months Syn (think its female) has became aggressive towards my JD and has inflicted damage to my JD's tail and fins. I now have a divider in my tank and my JD is healing nicely.

Ive had my Syn and JD for about 1.5 years. I originally had an oscar and texas but the were rehomed for other reasons. For about the first year the JD was the boss, not aggressive but just kept everyone in check, Probably because, at the time he was the biggest. Has time went on and the syn caught up in size she kept trying to challenge the JD, for awhile JD continued to dominate. Around dec last year the tides turned, Syn was finally big enough to win a fight with the JD, She continued to harass and attack when he clearly didnt want to fight any more. This was when i split the 2 up with a divider. I tried to re-introduce them on several occasions but fights always broke so i would separate the again. I did come home one day to find both fish on the same side of the divider, they seemed to be getting on fine and JD seemed to be in charge. They co-existed for a few weeks before the syn snapped and beat up the JD again.

I should mention my tank is 6x2x2. Syn is around 9inch, JD is about 7.5in
Other tank mates are silver dollars, small severum and bristlenose. All other tank mates are ignored by both Syn and JD.

My other tank is 55gal. Clown loahes, severum, BGK

Im looking for option that dont involve re-homing any fish..... if possible.

My observation is the syn is only bothered by similar sized fish as ignores the smaller placid tank mates.

I was thinking..... Would it be possible puts the clowns and sevs in with the Syn and JD alone in the 55gal? Or would that just be asking for trouble ? Ive had some of my loaches for a few years and most are oddballs so i would hate for them to be a syn snack, DO syns even eat smaller fish? Originally my cichlids and clowns were housed together but were separated once i set up a bigger tank for the cichlids. I did at one stage come home to see JD with a clown hanging out of his mouth. Over time I lost another 1o 2 more clowns, i blamed the JD but will never be 100% sure.

Another option i have been pondering is introducing some fish larger then the Syn. I have seen two 11-12inch oscars listed for sale close by me. I know introducing large fish can be hard work but any chance it might work?? As long as the oscars are not super aggressive and they become tank rulers due to size would this by any chance calm down the syn?? Or would she just continue to throw her weight around and harresse the JD.

Really dont want to rehome any fish but my syn been making life hard for the last few months. She is such a beautiful pics and the photos dont do her justice.

I had 2 other smaller syns but were rehomed due to aggression when they were much smaller. I was actually under the impression that Syns were some of the more mellow veija species. I guess I was wrong.

Hoping other Synspilum keepers and all you pros out there can provide me with some good info on what to do next! Are all Syns just A-holes?

CheersIMG_6572.JPG IMG_4598.JPG IMG_4639.JPG IMG_4747.JPG IMG_5086.JPG IMG_5096.JPG
 
Aggression between the syn and jd will only get worse, I wouldn't add another large cichlid, the syn would probably kill it before it had a chance to settle. Imo the best option would be to move the jd to the 55
 
I agree w/ Dan, that’s really your best bet. Are you sure that syn is a female? Looks male because the sloping forehead. Beautiful fish btw!
 
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I agree w/ Dan, that’s really your best bet. Are you sure that syn is a female? Looks male because the sloping forehead. Beautiful fish btw!
Im not certain is female....just thought males have much more of a sloping forehead....I could be wrong though
 
Aggression between the syn and jd will only get worse, I wouldn't add another large cichlid, the syn would probably kill it before it had a chance to settle. Imo the best option would be to move the jd to the 55

So JD to the 55g and clowns in with the syn? You think the syn will eat them or just ignore them as the dont pose a threat?
 
I agree with the Dan and Toletcar, the Vieja will not be tolerant of another (any other large ) cichlid, the clowns could "possibbly" be ignored, because they aren't cichlids.
I also have a feeling if you put the sets with the Vieja, as they gain size, they will also become targets of the Vieja aggression, as it is the alpha and alphas don't like any other cichlids that even slightly resemble themselves.
 
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Hello,
I have found synspilum to be one of the less aggressive vieja. However, they are still Viejas and can be very mean. It seems like yours fits this description.
I do think theres a possibility it could live with some other cichlids, maybe even with your JD. 2 cichlids is pretty much always a bad number, because the subdominant one is picked on constantly and has nobody else to share the big guy's aggression with. I wouldn't go and add big cichlids like the oscars, that the vieja would most likely see as a threat, and attack.
One idea would be to add two more cichlids roughly the size of the JD. Add them at the same time and completely re-arrange the tank. The hope would be that the syn would still be dominant, but would pick on all the smaller fish equally, and the JD wouldn't be singled out.
I would only try this if you have an easy way to re-home the other fish if it doesn't work out. I personally think it would be worth a shot, but your synspilum might just not want to share the tank.
I'm not crazy about the option of putting the JD in the 55, because the tank is a bit small for a JD and severum together, and then you've got just 2 cichlids together again, might be same dynamic. I'd probably try a couple more fish in the big tank before I did that. If it didn't work though, the JD and sev in the 55 wouldn't be the end of the world, but wouldn't be ideal either.
 
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