I have two microsword scenarios for you guys.
I've had little success getting it to carpet in sand with DIY CO2, I suspect the sand consistency and CEC, and my planting method (sparsely planted) more than anything, sand was bedded with root tabs, 96w on a 30gl.
Second scenario is great success in short time, SMS over 1" Eco, pressurized CO2, 192w over 65gl, planted 1-1.5" clumps in a checkerboard pattern, carpet filled in very quickly. Both tanks had similar dosing, same 67k spectrum, both 3wpg (although I think the more light makes a difference in these scenarios, regardless of WPG, 96 is 96 and 192 is 192). The 30 has more bottom feeders ie pleco, cories although I don't believe they would've effected the 65gl's growth.
That's all I can say really, there for your own speculation. You can see progress pics in my 30gl and 65gl sig links. It's hard to see in the 30, middle-front, over a year old and still not a carpet.
I would say lots of CO2 should be on hand mainly to fight off BBA if it comes, it will go after and really slow the microsword. Also, it'll speed growth a lot and that's desirable when you're trying to get a low plant to essentially grow on top of itself to make a thick carpet, otherwise it might take a more relaxed and meandering approach to growing, but that's my assumption, I'm sure somebody has done it without CO2, this hobby definitely has a full spectrum of experiences.
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