That is awesome dude. Definition of low-maintenance. Very well done. So no substrate at all below the foam, right? Say you get rid of the BD sand and place some epiphytes on small lava rocks behind the seiryu's - NLJF's or tridents or bolbitis to give you the vertical aspect, that will make this the ultimate low tech. Plus complete clean up just by removing the rocks and the foam and maybe instant rescapes just by moving rocks around. No Co2, no dosing, as well?
Keep us posted..