Opinions on "NATURAL" setups

[HolleyAkers]

Hello all,

I'm new to the forum, we've had our syrian for 6 months or so and a robo for couple years. My question is regarding "natural" tank setups. I've seen many beautiful setups on pinterest and would like to get a few opinions on the safety of this type of set up.

Problems I'm concerned with since hammys tend to chew:

--many of these have some kind of moss, my gut tells me this isn't safe to injest.
--it looks like some use craft wood pieces to build levels, how to connect them? Glue?

Has anyone had experience with setups like this?

I've attached a few pics for examples, these are not my setups.

Thank you in advance.