when should i up cage size

I have two balls each in there own 5.5 gallon tank they are only a few months old and are fine for now but when should i switch them to a bigger tank.

IMO they should be in 10 gallon tanks at this point...

When it comes to plastic tubs here are the sizes you will need according to your Ball Python’s size

Up to 500 grams – 15 Quarts (17"L x 11 1/8"W x 6 3/8"H)

Up to 1500 grams – 32 Quarts (23 1/2"L x 16 1/4"W x 6 3/8"H)

Above 1500 grams – 41 Quarts (34 3/4"L x 16 1/2"W x 6"H)

Ok thank you i will be moveing them to the ten gallons.