Hi,
Are there size differences in them? my Costa Rican auratus are about an1 3/4" for the females and 1 1/4" for the males.Ben Green has a good pic of a males toes on his site
http://www.thechocohut.com. What I was doing was feeding them very well and misting them about 2 times a day.Depeneding on your hearing, their call is best described as an electric razor running low on batteries,so a low buzz.
The female will chse the males stroking his back so if you don't hear calling that is a good indicator also.Whe either my males or females are "in the mood" they will wrestle some.I have a 2.2 in a 20 high now.
I hope this helps some, they are great frogs.Oh, try to get something to put under the hut in case you do have a pair such as a Pringles lid or petri dish.Good luck, they are great frogs.
MW