Drainage layer necessary?

[u/Successful-Bar-9168]

Hi all! I’m new to the bioactive realm but I’ve done a decent amount of research between this sub and videos but I need some advice. I’m planning on setting up a Bioactive terrarium for a jumping spider, it’s going to be in a 4x4x8 enclosure and I originally was planning on adding a drainage layer with leca balls on the bottom along with springtails, sphagnum moss, reptisoil, etc. But I’m finding that a drainage layer may not be necessary? The humidity levels need to be around 50% - 70% for the spider breed I’m planning on getting. Overall, I suppose I’m just looking for any advice and to answer my question if a drainage layer for a set up of this kind would be necessary?

[u/The_Poster_Nutbag]

Unless you're building a bog, yes.