Both plants droop. One is dry and one is drowning, and the leaves look the same either way. A closed terrarium hides its own evidence. The plants droop, the glass fogs, something white appears on the substrate — and every symptom has at least two causes pointing in opposite directions. Fittonia wilts conspicuously when it is genuinely dry, which is useful, and also encourages overwatering when every wilt is treated as thirst. This manual is organised by what you can see, because that is all you have: 14 symptom tables that name the likely causes, say what to inspect next, and send you to the page that explains it. 38 pages on condensation, mould, moss, pests, light and plant-by-plant decline, with 19 references listed and 7 cited inline. The correction this guide is built on A closed terrarium should be opened and aired every day to stop mould forming. Venting is a measured correction, not a daily requirement. Where there is excess condensation, the guide’s sequence is to check the root zone and recent watering first, then remove accessible condensation with a clean cloth or briefly open the lid while monitoring the plants, and recheck once the jar has returned to its usual conditions. The difference matters because a jar opened every day is simply a dish garden that dries out, and the owner then waters it, which creates the saturated substrate the daily airing was supposed to prevent. Correct the cause, then close it. What it answers Is my terrarium plant drooping from too much water or too little? How much condensation is too much? Are springtails a sign my terrarium is healthy? Why is the moss in my terrarium dying? What you get 38-page PDF, US Letter, with selectable text Reflowable EPUB for e-readers and phones — both formats, one price 14 tables 7 sources cited inline, every one linked (19 listed in the register) Instant download. Nothing ships. Before you buy This is an English-language digital guide. No physical materials, kit or printed book is included; anything the projects need is bought separately. The cover is an illustrative image. The interior is text, tables and worksheets. Published by TopDigitalKnowledge. Written by Abdelmounim El Moussaddar.