White saum/M or F

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We are not doubting that you can keep a male GT in a 4 foot,it's just a little kinder on the fish to keep it in a 6.
Any fish that has grown to 6 inches in my 90 gallon looks cramped and I feel I have to move them to a bigger environment.
You can keep a donkey in a basement but it's better off in a field.
 
I have to jump in here a field to a basement is not in a good comparison to an extra 2 feet in an aquarium, apples and oranges. A green terror could potentially grow past 10 inches but there's a slim chance it will. It will most likely be in the 8-9 inch range(optimal conditions) an 8 inch fish doesn't need a whole 125 to itself, if you give an extra 2 feet it's just generous in regards to comfort but you can't knock someone for giving a 75 to an 8-9 inch fish lets be real here
 
I can.
I think a 75 is too small for a 9 inch fish.
That's my belief and I'm entitled to it.
I have seen many gt's reach ten inches and slightly more for a male.
Maybe the ones your used to are a little smaller cus they have spent their life in a 75.
The basement and field thing was just an analogy not to be taken too literally.
I didn't knock anybody anyway.i just said it was kinder to keep it in a 6 foot than a 4 foot.
Much kinder,so let's be real here.
 
I personally don't see any issue at all keeping a single mature riv in a 75g. We are already depriving him of companionship by keeping him alone. I've kept large mature males in 5 and 6' tanks and never found them to be particularly active at this size especially with no other tank mates. If anything just glass banging their own reflections. They are rather chill fish but there are always exceptions.

After all we are still keeping fish in captivity. You could due a lot worse than a 75g
 
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So your depriving him of "companionship" and space.Lucky green terror.
No stimulation no room to swim and deprived of the chance to ever mate.No wonder it hardly swims and just glass bangs like some mental case.
Your experience with these fish is completely different to mine.I kept mine in a 7x2x2 in a harem.I found them social highly active fish.They energetically used all the space.
I never once saw mine glass bang or mope about.
I find most large cichlids in solitary confinement glass bang a lot more than those housed in communities.I wonder if lack of stimulation has a role to play.
I'm not saying I am right or you are wrong but these are my views on housing this species fairly. At the end of the day we are trapping these animals in a glass box no matter how big it is,so why confine them to the absolute minimum?
If your comfortable keeping a fish like a green terror locked up in solitary confinement in a tank that small, that's up to you.Personally I couldn't do it.
 
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