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From my point of view gravel plays two major tasks in tank. First, it make aquarium looking more naturally and Second, it support biological filtration.
I was trying with tanks without gravel but unfortunately don’t have pictures. I was using small volcanic lava stones and second time, pieces of coconut shells to cover bottom of my tank. Finally I found it more difficult to clean dirt between lava stones and coconut shells then siphon gravel.
Mostly tanks without gravel are used as breeding or quarantine tanks.
 
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