I lost the smaller of the orbygini's, she was attacked by the largest female motoro a few months ago and lost a large chunk of her disc from it. She survived the attack but was never quite right again and slowly ate less and less before dying a couple of weeks ago. I removed both of them from the 205 and put them in the 180 after the atack and the remaining orbygini is still in there.
I still plan on the 400g but its just a bit too much for me to afford right now, the pond will only cost me about £300 to build and another £200 for the filter where as the tank alone would cost me more than that for the 400g. I was always going to do both but have changed the order around, i'm sure the fish wont mind having the bigger space earlier.