Hi again.
Tank looks pretty cool
I see cory, although they prefer sand I'm thinking that your gravel looks like the smooth variety? If so they should be fine.
I mentioned before that, IMO, your sized and shaped tank is not suitable for the very lively Danios. I say this because as it grows it will seem to dash all over the place due to not having enough 'leg room' (or should that be fin room!) A small tank should be a peaceful enviroment, Danios get super-active
Anyway, just trying to be constructive.......nice job otherwise