CommSec Iress. Also can't put orders in at midpoint, but if I'm not mistaken, in your case when you get the trade confirmation from CommSec it should show that they were able to buy on your behalf for 0.0055 saving you 0.0005 from your 'limit buy order' of 0.006.
MRD Price at posting:
0.6¢ Sentiment: Hold Disclosure: Held