Dosing nothing actually. On occasion I toss in some Flourish Excel (and by occasion, I mean... approximately once a month!). It's got Flourish root tabs, but those were added months ago. I have a little algae in the tank (some hairy stuff! no idea what it is, but it isn't taking over, so I'm not worried about it). I have Flourish & Flourish Excel, but because the tank is over-stocked (a huge bioload in the tank... filter on it is only an Elite Hush 20), the plants seem to just grow of their own will. The Hygrophila grows like a weed!.
The tank itself gets water changes once every week to two weeks. Any more frequently, and the plants start to die off.
You seem to be having excellent results considering you're not dosing anything!
