A 10 gallons aquarium is way too small for a banghai cardinal. Chances are he won't live very long.
If you have a lot of algae growing then your nitates and phosphates are surely not at zero. Put some GFO in there and that will help.
I would return the banghai and put some fish that are suited for a 10 gallons. A dartfish could work, and maybe one clownfish. You can't put too many fish in there because they might die from lack of oxygen especially if you have no sump and no skimmer.
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More fish die from human stupidity than any other disease...
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