120 gallon stocking suggestions.


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Imo, it’s not overstocked assuming you have good filtration, do regular decent sized WCs, and don’t overfeed. Remember, though, that the Angels will get pretty big and there is likely to be territorial/pairing issues. Finally….I have read that Columbian Tetras can be nippy/semi aggressive, so keep an eye on them with the Black Skirts and Angels.

Sounds like an interesting tank….post a few pics when you can.
 

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I don’t think it’s overstocked, but swordtails need hard water, the other species you have are soft water species so there is some incompatibility there.
 
6 angels in a 120 is asking for trouble when they mature. 5 males and a 1 female or 6 of the same sex can coexist in some cases but generally speaking 6 angels of mix sex is asking for the slow death of excess angels. This typically occur 6 to 12 months AFTER they reach maturity.

Also adult angelfishes might eat the head and tail light tetra - not super likely but male head and tail will be smaller then females and adult male angelfishes can get fairly large.

Also i tend to prefer not to mix asian fishes with sa fishes but that is just myself. I do sometime mix west africans with sa fishes though it is usually a bad idea.
 
I kind of agree about the angels, but they can be unpredictable. it is certainly not easy to get 6 that will get on together long term, having said that I once had 6 in a tank of about 150 gallons, only one became a problem, when he (or she) was removed the others were fine, constantly bickering but no one being hurt or picked on.. It’s just important to keep an eye on them and remove any troublemakers or any that are obviously suffering, before any deaths occur.

I also don’t mix Asian with South American fish for what it’s worth…
 
constantly bickering but no one being hurt or picked on..
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That suggest that 5 of them were males which is one of the combo that works. I think just 5 females tend to not bicker though the females are a bit less predictable as to if they get along or not.
 
That suggest that 5 of them were males which is one of the combo that works. I think just 5 females tend to not bicker though the females are a bit less predictable as to if they get along or not.
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I did suspect that at the time, there was never any breeding activity and all but one (including the removed one) were very big.
 
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I’ll address that if the time comes. And rehome some if I need to. As of now I’ve had 0 issues whatsoever with the angels I really really doubt they are going to be able to eat a head and tail light tetra. But yah if their aggression becomes to much I’ll remove some until I find the combo that works
 
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