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While I do agree with what you are saying, there is nothing wrong with letting them eat only the roots. You are forgetting what is living IN and ON the roots rather than the roots themselves. The live and dead/rotting roots can harbor many microorganisms that the beta can eat, each with a good amount of protein.
"These microorganisms are called
Nitrosomonas. They are the tiniest of organisms. Oftentimes, fish can be seen picking at the roots of plants, rocks, and various objects in the aquarium. They are devouring plants and animals that are usually seen through a microscope.
Thankfully, betta vases have gone the way of the pet rock, but when they were the rage many of the fish housed in them survived solely on microorganisms. Evidence of microorganisms can be readily observed by simply floating a well-seasoned biowheel in an aquarium. Fish that feed on them are enjoying a fresh micromeal."
-Freshwater and Marine Aquarium Magazine (FAMA), September 2007, Volume 30 Number 9.
Heck...I was out of dog food today so my dogs got "puppy chow". I myself could live off of 3 musketeers and mountain dew but it is not a good idea if I want to stay as healthy as possible....but to each their own. Now that is a human ...not a fish.
But suddenly I have a craving for chocolate...
When they are small (betas) some feed them micro worms...very small...but as they get bigger more substance is good. Brine shrimp, grindel worms, etc.
No hard feelings...just discussing it. I hate typing things because you lose the personality part of it....I am not arguing...just discussing it I am so glad you brought up this point!