Which plants in your terrarium are dying? Maybe someone here would have ideas or suggestions as to why those particular ones aren't thriving.
LOL, I'd purchase a terrarium like your beautiful creation ... but I have to admit that I'd probably never make one. I'm old and lazy and have a very short attention span so
knowing me like I know me, I'd start the project (with the Great Stuff Foam) and then I'd get sidetracked and it would still be sitting unfinished six months later.
What kind of frogs are you adding to your terrarium? I put a little anole lizard egg in one of my terrariums a few years ago and it hatched. My husband caught live moths from around the porch lights which we fed to little "Lucy Lizard" (as we named it) through the winter months and then we released her outside when the weather got warm in the spring. I found a little lizard egg in one of my container plants on the deck yesterday and thought about placing it in one of my terrariums but nowadays we just don't have time to catch moths to feed it (if it did hatch) so I just left the egg in the planter.
I hope you will share more photos of your terrarium when you get the frogs; It's really a beautiful terrarium!