No bird-scaring device. Just some white plant labels. The rock on the left is tufa, for growing some pings on. The tall things are a spent Darlingtonia flowerstem and a bit of typha minima.
The problem I had with it for the first few weeks was that the water didn't soak away under the soil and out of the hole in the side properly. It created some kind airlock on the surface and just sat there in a puddle. It took a few days with the soil held away from the inside of the hole (to allow the water to escape) before a proper through-flow of air and water started, which I think may be useful to avoid stagnation.
If I were to do it again I would add even more open material into the compost to make it drain as well as possible. With a good 8" or more of undrained tub at the bottom there will be more than enough moisture. The mix in there at the moment is peat, pine bark, sand, grit, perlite, and quite a lot of vermiculite (I wanted to use the latter in order to take the pH slightly less acidic for the benefit of some orchids in the tub - but the balance is still acidic). Lots of live sphagnum moss would have been a good addition - but it's hard to get hold of in such vast quantities.
With the soil this high a lot of the excess water drains straight off the top in heavy rain. The moss covering (a mix of acidic woodland moss and bog sphagnum) was necessary to stop the soil washing away in downpours. I can't think of a good reason for one soil level being better than another, I just instinctively thought I may as well fill it up!