smells like hot grabage

So I happen to another tank ..... that I am going to use for a hospital or
feeder tank.
so I pulled out some gravel from my big tank (55) becuase even though I have
live plants I got WAY to much gravel in there....
So I take enough out for the small tank and set it up. and re-setup my large
tank. well even with the filtration I have on there (whipser 40, Penguin
170, and a powerhead 402 with the quick filter attachment) my water is
starting to smell like $%^, So I have done a water change and a carbon
change. that helped some but it still smells really bad.

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