Tetranychus ludeni is certainly a good chance, but there are other Tetranychus with broad host ranges and that look much the same. Tetranychus neocaledonicus would be a prime suspect and it’s the most common species in north Queensland and attacks many host plants. It’s easily the most common species of Tetranychus in Brisbane gardens, too. Other possibilities are the red form of Tetranychus urticae and Tetranychus marianae. The latter tends to be the most common Tetranychus after T. neocaledonicus in surveys from northern Australia.

Whatever the species, you need a lateral slide-mount of a male (and a dorsal mount of a female) to work out species by their morphology.