eventually, war will break out between these two territorial fish and one will die...
it could be in a week or in a year but once one of them establishes itself, theres just no where to hide in a 7 gallon tank.
Also, as far as rinsing food goes, in a tank as small as that, every little bit helps...that being said, you SHOULD be doing enough regular water changes that it really shouldnt matter.
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