the standing was the first in the tank and not long after i ordered a female for him .. well i got the gold dust instead .. I dont know how you mix up a golddust and a standings but they get along just fine together ... they were both about the same size when I stared the setup so they have been together for about 5 years now .. and the green tree frogs were just added a month or so ago and seem to be just fine they have doubled in size ..