I've read on here that the recommended tank size for WTFs is 20 gallon for the first frog and 10 gal for each additional frog, but the Exo-Terras don't list gallon equivelant, so how many WTFs could the following tanks safely hold under proper conditions?

Exo-Terra Natural Terrarium Large/Tall

90 x 45 x 60 cm / 36” x 18” x 24” (WxDxH)

Natural Terrarium Large/X-Tall

90 x 45 x 90 cm / 36” x 18” x 36” (WxDxH)

Exo-Terra Natural Terrarium Medium/Tall

60 x 45 x 60 cm / 24” x 18” x 24” (WxDxH)

Natural Terrarium Medium/X-Tall

60 x 45 x 90 cm / 24” x 18” x 36” (WxDxH)

Exo Terra : Terrariums