Re: 300gal paludarium project
looks like a great candidate for several killie fish or hatchets or small tetra schools. I had a paludarium setup very similar like this but half of your size with several neons and hatchet fish.
It's looking real good right now and watching your post changes my way of constructing tree roots (they're awesome in your tank). But also i'm sure you've considered this - if you're gonna put dart frogs in there stick with aboreal species and acoount semi emeresed growing plants like cryptocornes, hygrophillia, tiger lotus or dwarf lillies and even aubias to cover all areas where your animals may fall off the tree limbs from above. those plants i listed are very few of what can grow both in and out of water except the lilles. I've always kept it as a principal for all my terrestrial animals to keep them from drowning but i'm sure you alreadywere aware of this and had plans. I'm subscribed and anxious to see the fish and plants in there!