These supposedly dwarf species of Australian tarantulas aren't really true dwarfs being that they can reach upto a max size of 110mm.
Currently around 15mm diagonal legspan
Besides tropix having inter-cheliceral pegs under a microscope and being smaller in size they are very similar in every other way to their close relatives in the Phlogius genera.
Distribution: 
Tropical north eastern QLD. 
As slings they only require a 500ml round tub 2/3 - 3/4 full with peat moss and half the surface scattered with Sphagnum moss to mist and hold humidity I always add vents holes (1-2mm max) to prevent mould but I also additionally remove excess prey after feeding.. that helps builds up their appetite for the next week and also helps keep mould away!
Max size 110mm