I’ve had great with success with chaeto but I’m currently trying out sea lettuce aka ulva in my reactor. I’m in week 2 with it and it’s definitely growing. I’m probably going to give it another week or so of growth before harvesting. It seems to grow a darker shade of green in my reactor than it does in the tank.
I’ll post a picture here when I harvest it. I’ve started experimenting with my reactor to see what algae works best for the tank. I’m planning on trying a few others on algae barn after the ulva.