Re: My First Vivarium Journal
I'm not sure a carpet of hairgrass is comparable to a tropical grassland, which would have large plants & clumping-type grasses that create protected pockets beneath them... Plus the ecosystem's entire history of growth, death, & decomp built up on the surface which is basically what leaf litter is meant to replicate.
Thriving hairgrass grows pretty dense- I'm not sure that frogs would be able to hide in it more so than trample & sit on top of it. It would keep the frogs off the substrate & create an interesting hunting zone for sure, but it just doesn't have all the benefits of leaf litter.
I'd recommend adding a section of leaf litter to the front as well for the sake of your frogs and clean-up crew. Plus, it'd prevent your hairgrass from eventually growing into your dragon's tongue.