Hm,

if you really ask me..I am not surprised about your limited breeding success.
All tanks you picture show very limited places for the tokays to hide securely and are not of sufficient height.
To feel secure, tokays should not be kept in tanks less than 3 ft tall.
Moreover they do much better if only the front of the tank is transparent and the other walls are fake rock or bark.
Also even though I so often see tokays in 20g tanks, even after >20 years of tokay experience, I would not keep adultas in tanks smaller than 65g.
Behaviour normally changes a lot in larger tanks.
The most agile -and prolific- tokays I have do live in a >1100g tank.
But of course you don´t really need sth that big.
But a 100g is nice anfd the Trio I keep in such a tank also does well and produces like 20 Babies a year.
If I imagine y larges 250 g male to live in a 20 g....no way.
This is not to blame you, just to clarify, what tokays need and under which conditions they thrive best.
Ci@o

Ingo

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