well keeping it hight does lower noise and as long as you have an air pump going oxygen doesnt matter. so i think its more preference. keeping it low allows air to run across the surface more and helps keep from overheating, but not if your tank is already good with temp.
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10 Gallon
2 Fire Belly Newts
1 female Betta
4 male Endlers
1 female Endler
1 Baby Gold Nugget Placo
Various Cheery Shrimp
5.5 Gallon
1 Female Tequila Sunrise Guppy
4 Cherry Shrimp
2 African Dwarf Frogs
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