Since in nature, severum are primarily vegetarian grazers, feeding a spirulina or algae based pellet would such as as Algaamax would work.
But also providing a leafy green to graze on throught the day could also work.
For my vegetarian cichlids, beside hanging greens on manets, I allow algae to grow on obejects like wood or rocks.
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In nature severum are known to consyantly pick at and graze on growth of sunken, waterlogged wood