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Old 03-20-2010, 05:51 PM   #11
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Those dard spots are indeed hydogen sulfide and are caused by anorobic bacteria and the lack of sand sifters. Get a sand vacume and slowly do the sand one small spot at a time. Don't do it all at once. You don't want that nasty stuff all over your tank.
YIKES!!!
So how did this happen? My sand bed is only 1.5in deep...
How bad can this be? Should I worry much about it? How can I prevent this? I dont guess I have a DSB occuring as well do I?
Matt
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Old 03-20-2010, 06:25 PM   #12
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No, it's just a dead spot. It does not look so bad at this point. Just vaccume it up slowly, one spot at a time and it should be okay. It looks like you are feeding to much or that the fishes don't like the food that you are feeding.
What and how often do you feed.
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Old 03-21-2010, 01:22 AM   #13
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Why do you think these particular dark spots signify hydrogen sulfide?
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Old 03-21-2010, 07:32 AM   #14
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I had a couple of these spots in my tank and boy did it smell like rotten eggs. I added a bunch of sandsifters and that corrected the problem.
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Old 03-21-2010, 07:46 AM   #15
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Where does this hydrogen sulfide come from? How does it form under the sand?
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Old 03-21-2010, 07:48 AM   #16
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anarobic bacteria breaking down detritus in the sand.
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Old 03-21-2010, 07:53 AM   #17
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Ok fair enough. Now (hypothetically) a person has put in their LR and sand and then cycles etc and gets fish. Nothing ever stirs his sand. Hows does that detrius get there?
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Old 03-21-2010, 08:03 AM   #18
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I believe it's called convexing where very small objects are drawn together. So the very top layer of sand is where the arobic bacteria first break down the uneaten food and then some of that is drawn down where the anarobic bacteria break that down further. Well something like that is where the rotten egg smell kicks in. Sand sifters prevent large spots to developing.
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Old 03-21-2010, 08:22 AM   #19
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Cool. Thanks TC. I've only got hundreds of worm things that build sand tubes in my sand bed but they do a great job as a CUC and sand stirrers. They plus some bristles worms, and some slugs are my CUC. I couldn't have a better one IMO (and it was free).
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Old 03-21-2010, 08:29 AM   #20
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Yea, I use to love looking at all the creatures in my sand. It is totally amazing!
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