I'm surprised that you consider coconut fiber to be "sterile" as it rots quickly when exposed to a constantly damp situation without much ventilation similarly to peat mixed substrates. I would think that a water based enclosure with an overflow setup similar to a saltwater tank would work best as it would constantly replentish the area that the frog sits with newer cleaner water from a filtered sump that pumps water back up to the enclosure the frog sits in(and across the cork bark and attached pothos so that the water isn't so turbulent for the frog) so that the frog isn't force to constantly sit in filth. I also think that floating java moss in the frogs enclosure would help knock out nitrates too as well as provide a good cover for it. If the frog desire to get out of standing water then it could easily climb onto the corkbark section and since the pothos is rooted to the corkbark and not in soil, then there would be minimal risk of uprooting. Sorry for the novel, but that's my idea on an easily maintained yet naturalistic and functional enclosure.
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1.1 Chocolate Leucomelas
2.0.2 green and bronze auratus
0.0.1 D. truncatus.
3.2 K. Maculata
0.0.1 blue white's tree frog
0.0.1 birdpoo mossy frog

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