After it is completely grown in.. Other words when the carpeting plants have fully matted and secured the substrate with roots.. The main plant responsible for that will be Lileaopsis brasiliensis.. And maybe helanthium tenellum, both reproduce with runners in simmular fasion.. But yet wasn't realy very succesfull in transitioning this plant emersed.When are you adding water?
Thus it all depends, i can't tell.. The plants will tell me when its ready to flood.
Flood level will be about this.. Not higher..
But i might do a test fill soon.. Its a burning thought.. I think i need too.. Than i can also test run the HOB and see the streaming gully work in real time.
Than i'll show.. But i'm a bit with premature flooding.. Should i take that risk?