Re: normal or bioactive terrarium??
A true bioactive enclosure will have approximately 30 cm of substrate (clay drainage balls, mesh screen, soil, sand, gravel, mulch and/or leaf litter). It will also contain worms, isopods, spingtails, and possibly other invertebrates. It should also have several plants. The entire cage will probably weigh 225 kg or more.
The boa will damage the plants frequently and you will still need to clean the cage weekly. A bioactive setup is a large investment with little value for a snake like a boa. The setup will look nice, though.
The easier, and more common approach, is to include elements of a bioactive setup in a regular cage. Place a couple inches of mulch in the cage, possibly with some leaf litter. Add a small number of invertebrates, usually isopods. The substrate will look nice and you will receive several of the benefits of bioactive setups. Also, the cage will weigh 200 kg less and you will not have to buy new plants frequently.
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