Thanks for the suggestions! I already grow sundews and venus flytrap, but they cannot grow emersed in the manner that I'm looking for. I'm looking for something that can grow out of about 7 cm of water. The perfect look would be something reed like. I've tried with different reeds for ponds, but they don't last. I think it gets too warm for them. My experience is that most plants don't love acidic water, at least not if pH<6.