The SW hobby seems to run through fads on covers. For awhile, all SW tanks were covered, mostly for the same reasons ase FW tanks. Covers keep dirt, pets, and kids out, and keep fish and water in. Then the trend was to use an open top, or no cover. This gave much better gas exchange CO2 out, O2 in. However, the fish could jump out.
I prefer a cover, but others use a screen cover, others use no cover. In a way we are all right.
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