10gal Dry Start W/ Co2 Injection

You really don't need to use gas at this stage, I doubt it will make any difference above an beyond atmospheric CO2. Neither is there any real need to use H2O2.
The usual methodology is this...

1. Add water to a level just below the surface of the substrate, and aim to keep it that way; spraying every day can raise the water level above the top of the substrate.
2. Keep the tank sealed with clingfilm, but let fresh air in for 5 minutes every day to replace the old stagnant air, hopefully this will prevent mould.
3. Spray the plants on a daily basis with a dilute fertz solution, about 3ml TNC Complete per litre.

Here's a DSM I did earlier at 10 days


Here's the same scape at 60 days, using the above method https://www.ukaps.org/forum/threads/return-of-the-shallow.50172/...

 

Thanks Matt. And yes brighter lights do have that effect. Just keep an eye on your CO2 implementation, and up your fertz if you're using high light; both need to be on point, otherwise you'll get algae.

 

I wonder what would happen if you injected CO2 underneath the cling film. I wonder how fast things would grow with an increase of atmospheric CO2? Instead of 400ppm, you could have 1200 ppm. They inject it into commercial grow rooms for indoor agriculture. I want to do a comparison one day with two dry start tanks, but my co2 regulator is too far from where I’d want to run the experiment. Maybe it would shorten the time it takes to complete the dry start?