150 gallons and multiple plantsMight work if you're only growing one plant in a small tank.
My gut says I'm riding a winnerYou're welcome to try it in your cichlid tank setup, though my gut says it won't work well long-term.
This small amount of CO2 washing those plants in a tank that large won't register as fluctuationFluctuating CO2 levels tend to favor algae over plants.
LOW LIGHT!!! I've already started building an LED system where every plant will have it's own grow light and in the daytime that will be enough light to light the entire tank. There will be shadows but I believe fish like shadows and there's shadows in the real world. If the shadows are too much I can even control the shadows by turning up the main lighting system which runs separate from the white LED's flowing over the plants. By doing it this way I can decrease the total light output helping with algae problemsMy advice- stick with a low light setup. You're going to have so few planted areas in this tank that running too much light is just going to lead to algae issues.
I already started pricing them ...........I like the attitude of win, lose or draw but there is a small point I see coming around at some point. About 90% of folks don't want to get into the complications of pressure CO2 and many have started with Different levels of DIY. But then it follows that many do move on to the complicated equipment. I see is that as we do find a certain amount of success with growing things, we reach a point where doing more is the only way to go.
Compared to gardening outside, we often stop using the rake and hoe and move to a tiller. Be warned--- I see a pressure tank in your future!