My $.02-the key and most important aspect to a well-designed and successful vivarium is sustainability. A lot of folks can put together a viv that will look great for the first few weeks or even months, but many times that same environment will look terrible over time due to poor plant choices/placement and inadequate environmental controls. Over the years, we've seen this time and time again- new hobbyists spend hundreds and hundreds of dollars on orchids and rare epiphytes only to have them melt away and subsequently be taken over by Ficus 6 months in.
Frankly, many times a vivarium doesn't start looking close to its potential until at least 3 months into its evolution.
For the reasons listed above, I would suggest a minimum amount of time that the vivarium needs to be set up prior to being entered.
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