The only way to sex would be to hear it call. You can possibly get him to call if you look up "Green Tree Frog call" on Youtube and play it near his/her tank. I can get my GTF to call back if I play it on YouTube. Usually the calculation is one frog per 10 gallons, but you could possibly be okay with another GTF in a 10 gallon. But, if you want more you'd definitely want to upgrade! I answered your third question with the first one.![]()





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