No CO2, just a bit of Excel every 2-3 days. The HC is really starting to take off. There are a lot of tiny plantlets just under the pebbles. The shrimp like to nibble on it too so now I feed them every day instead of every other, or else I see tiny bits of HC floating around.
The moss wall started as a 2X2 inch square. It's tripled in size. The shrimp dig it.
I started with 2 pots packed in rock wool. I broke it apart into smaller sections and pressed it into the substrate with tongs. It took a little while for it to take hold, the shrimp kept uprooting it. It's at least doubled now. It's been just a few days past 2 months since I planted it. There is some on the other side that's not in the pic.
Hmmmm...well when I'm in the mood for a project, I'll have to take a big sewing needle and fishing line and spread it out. There's enough to cover the entire mat filter I'm sure. Plus the other side of the tank has a massive moss bush. lol