re: Large Vivarium Construction
To answer a few questions, the purpose for a false bottom is to provide a drainage layer so that the upper layer, be it straight sphagnum, soil, etc. does not stay constantly soaked. Things that are constantly soaked tend to rot, breed bacteria, etc. A false bottom or layer of leca (or volcanic rock as you have suggested) all serve the same purpose of keeping your top layer from sitting is water. It is my opinion that many hobbyists keep their tanks way too wet and with the volume of this tank you will probably want some ventilation and air movement to keep your plants and frogs healthy. The other thing you will need to consider with a tank of this size is that your subtrate will break down over time regardless of what you choose and you will need to add fresh layers over time. The broken down material will collect at the bottom of the tank and outside of a complete breakdown of the tank they will just stay there. Due to the size you are not going to want to break the entire thing down very often if at all. If you go with straight sphagnum, it will last a couple of years and what I do is remove the live moss that grows on top of it, any plants etc., lay down a fresh layer and put the moss and plants back on top of it. The mix you were referencing will last longer. You may also want to consider leaf litter on top of the substrate you mentioned. I don't know if that tank has drains on the bottom or not, but I would not want water stagnating in something that large. I'm assuming you are going to have some type of moving water, just make sure you don't have areas where large volumes of water can stagnate. You'll also need to figure out an escape proof top, which will be interesting.
Hope this helps and looking forward to see what you come up with.
Robb
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