Ok thanks. I had the same issue with Ammania in the past.
Good to know that araguaia has made an appearance in Canada. I can't decide if my next tank will have a foreground of araguaia, S. repens, or Elatine triandra.
Tank looks nicely divided into two areas. My vision for a tank that size would be to have one side dominated by a large fern, like a bolbitis sp. Will be interesting to watch this tank mature.