A bottom looks like a bottom it is just that simple
Like a babies bottom...
it looks like a coack
Cave rats look a rather lot like your bottom.
it looks like a coack
like the bottom of hilary's shoes
It look thick a little and curly at the bottom
kinda like this.... / \ / \ the lines on the top and bottom are parallel kinda like this.... / \ / \ the lines on the top and bottom are parallel
It looks like dirt at the bottom of your tank, It may look white or brown.
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the bottom of the feet.
See the related link at the bottom.
That depends on what species the bottom feeder is. There are very many species of fish that are bottom feeders.