As long as the gravel is only siliconed to the sides of the false bottom, there should not be too much of a drainage issue. I would definately pull that brom out from the substrate as well...while they may survive with decent drainage, keep in mind that you have a few inches of water right below it.Hate to be a party poop...but when you siliconed all that gravel to your false bottom I imagine you seriously inhibited your drainage.
To be honest, I would say that you should invest in more of a buffer between the false bottom and the soil layer. Your soil will have a hard time remaining dry enough if constantly exposed to the water level below...i would recommend putting an inch or so of hydroton or more gravel on top of the false bottom to allow better drainage, then screening or cocofiber planters atop that, followed by your soil layer.
To top it off, lay down some leaf litter for microfauna/frog hiding space...living in San Antonio, you have the privelege of magnolia trees at your disposal, and these leaves work great for a layer of leaf litter, provided the tree hasn't been exposed to pesticides and you properly sterilize them (rinsing, then baking for 10-15 minutes at 350 F)
I would advise against azureus; there may be enough floor space for one, but the size of the tree fixtures in there would be best used for a more "arboreal" or "vertically oriented" thumbnail species...ventrimaculatus are good beginner thumbs.
Good work on your first build, and keep us posted as to what you decide. And welcome to this addicting hobby...I promise, this won't be your last viv.