Increasing the fertility of your substrate is generally not a problem. Pushing plant growth is generally not a problem. If your tank is set up properly, with good drainage, good light, and proper, passive ventilation, your problem will be exactly the opposite. Your plants will grow like crazy, and you'll be in there cutting things back every month or so.
Personally, I would be very careful about what you may choose to add with the organic fertilizers you mentioned. Your frogs have never been exposed to whatever pathogens might be in your non-rainforest collected worm castings, bat guano, seabird guano, etc.
If you think rock dust is a good idea, for the minerals, please, look into clay substrates. They keep your tank bottom nutrient poor, the way that rainforest clay floors are, while supplying minerals. I believe you will find it more effective than rock dust. (He's not crazy, though, guys. Rock dust is often added to the vegetable gardens of old school, and organic, backyard gardeners. A similar gardening product would be Greensand, also used to boost mineral content of your soil.)
The first clay substrates in the hobby were done by Matt Mirabello. He actually pulled multiple samples from rainforest floors and had them analyzed in a lab for content. Calcium bearing clay substrates evolved from that. That is actually where the hobby got a starting point for how much calcium to add to your clay recipe.
Thanks again for your work, Matt!
A lot of great minds went into the research and experimentation with clay substrates. All I did was condense the good stuff into an easy to follow guide. Here is where all the original groundwork was done. You will see that countless individuals put their 2 cents in, all to build a very informative thread. https://www.dendroboard.com/forum/ge...te-thread.html