Help me with this debate

[embrit1]

What size are 20g long in inches please? am in the UK and can't get my head around gallon sizes haha x

 

[embrit1]

Ok found a calculator online.

I currently house 5 females of similar size in a 90g long tank ( this is 3 foot x 2 foot x 2 foot )

I have several moist hides for them, lots of caves and such and they get on great in there.

They have constant food and calcium/water in there and once a week on weigh day, I get them out 1 by one and hand feed a couple of waxworms. xx