Help building a defense team



Playing for a few months, so i have a lot of new players but i have problems building the best defense with what i have.
I need help on setting what i have now or what other player i should grow to improve my defense.

Regular V formation. I’d use:

Constance - Aradia - Myoin-ni - Persa - Farrah

You can also put Thalassa as tank, or even go without a healer.