Well... DSM is supposed to give plants the benefit of accessing ample Co2 direct from the air and allow for long photo-periods without algae issues, so you can get faster plant growth yet also have less problems to deal with.
The amount of time it takes to grow out many plants would be way longer (and they would most likely have to battle with algae) if you were to grow them submersed in a tank without Co2 injection. I guess you have to try growing certain types of plants in low-tech tanks to experience the true meaning of patience.
If you want to grow plants faster in a normally setup tank that is filled with water from the start, then you'll definitely need to use Co2 injection. It will ensure that the plants get ample carbon supply (along with sufficient nutrients and light) to increase their photosynthesis and growth rate.
It'll be best to get a complete Co2 system with solenoid regulator, so that you can put it on a timer and schedule the Co2 injection to match the lights photoperiod duration. Once setup and calibrated, it will automatically operate on its own everyday without requiring any further supervision. A 2 liter Co2 tank would be sufficient for a 2ft tank, you could also get larger Co2 tanks if your budget and space permits too, it'll just be able to last longer between refills.
You can check out a link to this Co2 system promo from East Ocean for reference (it comes with all the necessary parts and accessories included):
http://www.aquaticquotient.com/forum...year-Promotion! (not sure if they still carry on the promo though).
Lily pipes are meant to replace the canister filter's original plastic inlet and outflow pipes... glass lily pipes come in various shapes and designs to create specific types of flow patterns in a tank, and they look alot nicer compared to those original green or grey plastic pipes.
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