I do strongly, very strongly, disagree!
Tokays can be hardy and thus survive for decades under quite inappropriate housing conditions if climate and food are not too deviant from their needs.
But by nature they are active lizards which roam around and rzun a lot each night.
How can a 1 footer do this in a 20 g ?????
Keeping adults in a 20 g tank is thus somewhat -well, in fact more than somewhat- cruel.
I would not recommend to keep this species in tanks less tall than 4 " and with a volume of less than 55 g.
In fact even bigger is better.
As a standard I hence recommend 100g and up.
I have a breeder pair in a 120 g and a breeder group in a 770 g -and I still see quite a difference in agility.
The tokays in the 770g are much more active.
Even in that big tank the gex use every inch of all walls.

In a 20 g (or 55g) the risk that tokays of any sex fight each other is much higher than in bigger tanks.
But regardless of tank size, two males normally do not get along.
I once hat two brothers which really showed some kind of lifelong bonding -but that was a rare exception.
Even in the 770g it was not possible to let even a son of the offspring grow up to adulthood.
So first get a significantly bigger tank for your tokay. That is the most important, inevitable thing to do now.
Later you may think about a mate for him/her

Ci@o

Ingo

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