hmmm, dont think moving the driftwood would of caused it,
possibly the java moss?
sorry for your lost,
what are your water parameters?
last time i had it with my geos, was when i got those big geos u saw (happened 3months ago)
i used rock salt(from wollies) dosing at 1 tablespoon per 40 litres if you got plecs or plants, if not than 1x tablespoon every 20 litres,
bumped the temp and done water changes every day,
this was in the early stages still, but after 4 days i won.
good luck james