So, the dry start did not go well. Mold started appearing on the second day, despite leaving the top of the tank open, so after battling this for a week I decide to heavily plant and flood the tank. Bring it on algae! In addition to DHG and HC, I planted:
Alternanthera Reineckii Mini
Lindernia Rotundifolia ‘Variegated’
Ludwigia Super Red
Flame moss (Taxiphyllum sp.)(Packet)
Dosed with some potassium (suggested by guy at shop), added some liquid carbon, and half a small bottle of beneficial bacteria. I've ordered 4 liters of thrive but that won't arrive for a week.
Here are some pics taken a couple hours after planting. I'm pleased that everything stayed in the ground (I think the week was long enough for my grass to get some roots down). Also pleased that my tank is fairly clear. I'm not sure if the moss stew I painted on my rocks is still alive (Does it look dead or alive?). At least it appears to have stuck on. Will update again in a week.