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Marine
both
atherinops affinis means Neotropical silversides, it's a tropical fish that can survive in both marine and freshwater aquariums.
Diatoms can be found in oceans, freshwater, and also in soils on damp surfaces
they both have swag
the oceanic zone
river and lake
estuaries and lagoons
Neither marine nor freshwater fish excrete urine or urea; both marine and freshwater fish excrete nitrogenous waste products as pure ammonia.
estuaries and lagoons
Yes :) they are most common in marine environments though
There are both marine (salt water) and fresh water fish in the tropics.