How large is the tank with the 3 different species? it is recommended the one Whites Tree frog be housed in a 29 gallon tank. I dont know the specific care for the gecko or the tiger salamander but this tank does look small for 3 species.
it is hard to meet the requirements of multiple species that would normally never interact in the wild. and for them to be near to an alien species can cause a lot of stress.
it is possible to house different species in the same environment if they have the same care needs ie temp, humidity, light cycle. a lot can go wrong as well even in the best of set ups. a lot of animal meet a premature end for this. I do not know the experience level of other people on this site, specifically new members but in general I advise against holding multiple species in the same Vivarium.
There are exceptions to the rule and I belive experienced keepers can have success but if multiple species are kept in one Viv you need more space, more hides, more maintenance cross species contamination possibilities and fights will in crease if not enough space is provided and stress becomes a factor.
Nice looking vives though love the pacman
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In all things of nature there is something of the marvelous.
Aristotle
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