04-11-2013, 06:07 PM
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Putting a layer of soil is not likely to make any difference, as there are most likely other factors at work.
More data as others have sugested is needed in order to pin down the likely factors. What is the GH, and pH? [Mitch referenced these, but I can see no numbers in this thread.] What is the daily duration of the tank light? And, are you using any liquid fertilizers [I saw the substrate tab mentioned--this will help the sword as it seems to be doing, but will have no benefit for Cabomba]?
Using your Aquariums Log, I assume this is the 75g with the group of angelfish, correct? If that bubbler is still operating, I would remove it. I believe that will drive CO2 out faster, and there are not a lot of fish contributing organics to increase the CO2. Do you vacuum the substrate? And how often are water changes, and what volume?