I saw an immediate response from my plants. Quite literally, they began to pearl heavily only a few hours of starting up the CO2.
As far as growth, well, I have only been running the CO2 for 19 days now. My red melon sword which seemed to be dormant, has added about six new leaves, all of which have grown to nearly double the size of the previous leaves. My java fern hasn't grown significantly, but has put out about 8 baby plantlets since I started the CO2. I got some Riccia to plant a foreground carpet. The LFS only had a tiny little bunch, so I just have it floating on the surface now, until it gains enough mass to be able to anchor on the substrate. I would guess that in the last 10 days, the Riccia has nearly tripled!
My first DIY Planted Tank:
4x & 2x ODNO Flourescent Lighting (2-6500k, 1-5000k, 1 P&A)
Homebuilt Pressurized CO2 Injection
Rena XP3 Filtration
Still using my original gravel substrate