Jump to content

Hydrogen sulfide stain on background?


Kalopsia
 Share

Recommended Posts

Hello all, Because I will be moving, I decided to rehome some of my stock, but definitely not all. I sold off my shellie colony and as I cleaned out the sand, I noticed that the shellies built up a little sand mountain on the background. When I removed that area of sand, the background appeared stained black, just like some of the deeper sand itself. Question is, now that they are gone and most of the sand is gone, will the black stain on the background go away. I believe it’s a hydrogen sulfide stain. Do I need to scrub it to get it off or will snails eat away at it little by little? Does the water flow help alleviate the issue? Any and all feedback is appreciated. 
ps I can post a photo tomorrow as I didn’t have my phone near me when my arms were wet. I’ve lined some ez planters in front of it to make it not so noticeable, however tomorrow I will be doing a water change so I can snap a photo. Thanks again 

Edited by Manny
Link to comment
Share on other sites

Please post a photo. Does the stain go all way to the top edge of where the sand was and is the bottom of the tank black?
 
We can detect H2S in very low concentrations like 50 - 100 ppb. You would have known if you had H2S as you could have smelled it. 

Thinking about the chemistry, there is a pretty small chance you had enough sulfur (unless you were dosing it sulfate for some reason) to produce H2S in enough quantities to detect, let alone possibly stain the glass.  Your sand bed would have to be extremely deep, say 8 or more inches to possibly create anaerobic conditions suitable for the sulfate reducing bacteria to thrive. 
 

 

  • Like 1
Link to comment
Share on other sites

Ok folks. As promised here are some photos. Funny thing is that it was jet black yesterday and today it seems the water flow has cleaned it up a bit so I think I have my solution. Please pardon the shotty photos, I stink with a camera. Thank you kindly

DA313A41-A702-4C7D-924E-C3E0E0412852.jpeg

9E853952-6377-4CB7-AA1F-893AAD55EF1A.jpeg

6D6EDEF1-B0D1-47D8-B780-65EF4D157E00.jpeg

B0C63044-DED7-4F1F-A411-FAB99BB3A94A.jpeg

Link to comment
Share on other sites

Its probably some flavor of low light algae, fungus, or bacteria.  Exposing it to light is probably doing all the work of getting rid of it for you.  Before, it was probably the right mixture of nutrients and light, and now that you have disturbed it, it's probably going to shrink back and not be much of anything.

You'd probably know if you had any significant amount of hydrogen sulfide.  The human nose is very sensitive to it even at low concentrations (IIRC, ~ 5 ppm is enough for your nose to get that very specific rotten egg smell, and your nose burns out to being able to sense it ~12 ppm, again if I remember some of my safety training materials).

  • Like 1
Link to comment
Share on other sites

If it doesn't continue to clear up on its own, I'd say clean it with a brush like like you might use for cleaning dishes.  That should be able to get into any nooks and crannies and pull any gunk in there out, assuming the light and snails don't do it on its own. With the pictures you posted, it honestly isn't super obvious (but as I'm sure we all know, tank photography is hard and capturing what you actually see can be tricky).  If you hadn't said there was a stain, I probably would have just attributed it to lighting/texture.

  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...