I actually managed to get the tank swaped before work this morning. Airgas seems to open at 7 am Mo-Fri here... I will get home too late to install it, so my plants will have suffered a full 8h photoperiod without CO2. I think it'll be fine
I read some more about that grassy stuff and it may be Brazilian Micro Sword. The person who posted it in the plant profiles section of this forum actually said that it should be planted less densely as it will otherwise tend to cause algae.
I am considering pulling it all out and spending a couple of hours planting individual leaves deep in the substrate.
Problem with that is, I don't have real soil and my gravel is kind of a PITA to plant anything in. Even when I use tweezers I uproot half the stuff I just planted, when I go for the next stem. I may try it in another area of the tank just to see how it goes.