Red headed cichlid tankmates??

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Tank is fully stocked and you may still run into aggressive issues as time goes by.
You need to look at milder going smaller fish if you want more numbers.
 
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Syns are very peaceful I have my female in with buenos aires tetras, giant danios, and female siquia. I agree the FH will eventually pose too large and aggressive for the Oscar and Syn. I would look into housing the FH alone in at least a 75G and then adding more peaceful fish to your tank. Severum, some JDs are mellow others are not, Firemouths, Geophagus, etc. My favorite tank of the past was a standard 150G with 1 O, 5 Abalios, 3 Rotkeil Sevs and a group of 20 Buenos Aires which never got eaten.
 
Syns are very peaceful .

I wouldn't say that. I've had 3 or 4 over the past 3-4 years, and some are and some aren't. They have all been the top of the tank, or become top of the tank. And they are always involved in some way in every altercation that occurs in my tanks. They may not be the aggressor, but they are invariably involved, get involved, or start follow on incidents.

I think these fish can handle cramped quarters a little better than other Vieja or Amph's I've kept, but still--they start thinking their too crowded, I think they could get very violent.

I wouldn't crowd these fish too much.
 
Ive owned 3 different Syns to date and each have been very peaceful(for their size) often becoming the peacekeepers of tanks or happily cohabitation with small fish.

Have a friend currently keeping a Syn with discus due to its placid disposition.

Were the "evil" ones possible crossbreeds? I had a mutt Vieja years ago which was a nightmare, probably some sort of Syn/Blackbelt/etc mix.
 
The two people that have given you there experience on synspilum aren't the sort who will buy hybrids. If you house a big adult male with fish that it doesn't consider competition, it can be pretty peaceful, your on about housing it with a oscar and flowerhorn, there is a very highly probable chance you will be left with either a flowerhorn or synspilum, especially in a 120 gal
 
Discus and melanura seems a very odd mix.
One likes soft acidic warm water in the high 80s
And the other hard alkaline and around 75.
I wouldn't look in that direction for compatibility issues.These fish should never really be in the same tank.
 
I'm looking at my male Syn right now--he's in a 540 gallon tank with plenty of room, but he's swimming around with his fins all flared up, shaking his head at my Blackbelt everytime he swims by, looking outside of the tank at me to see if I"ll get up and drop some more krill in "his" tank. Any fish in that tank that object to him behaving that way--they pay the price.

6 months ago, he was the wimp of the tank, I almost re-homed him because I thought he just wasn't gonna make it in that tank.

Totally different fish now--that's what happens when they go from juvenile to adult fish. OP's Syn is 9 inches--it could very well go through the very same metamorphosis when it hits 10,11, or 12 inches.

But OP's Syn, if it changes like mine did, won't be in a big tank like mine. And it won't be in a tank with some Tetras, Danios, Convicts/HRP's like yours. Nah--OP's Syn will be in a cramped tank with a Flowerhorn, an Oscar, and probably a new Jack Dempsey.

And if the Syn doesn't go through this change, I can assure you all that Flowerhorn will.

And then--if OP has a problem and tries to put a divider in that tank--that's gonna make it worse instead of better.

So, you'd have to put 2-3 dividers in a 150 gallon tank?

Instead of looking to buy new fish, I'd be looking to buy a new tank.
 
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Agree with others, IMHO tank is already crowded once your fish mature some very bad things are going to happen. Good Luck.
 
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Discus and melanura seems a very odd mix.
One likes soft acidic warm water in the high 80s
And the other hard alkaline and around 75.
I wouldn't look in that direction for compatibility issues.These fish should never really be in the same tank.
Agreed it is a very strange mix....but to each their own. I personally would not do that combo. To make it more strange he keeps schools of Rainbowfish with them in a dutch style planted tank. I cannot argue with it as the fish are healthy and so far no bad consequences have occurred.

I have owned 2 females...and 1 male Syn; male got up to 14" current female is 11" or so. They have always been the largest fish in their tank as the tank was built around them...could be the reason mine were so placid. To me it has always just been to much of a hassle to house cichlid communities long term...and have currently just gone collectoritis with moderate sized tanks with mainly 1 fish. Some fish just require that for long term success such as FHs and male Parachromis IME.
 
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