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Pool filter sand

Posted: Sun Jan 16, 2011 8:41 pm
by Jshakour
I have been noticing in one of my tanks that has pool filter sand, the sand at the bottom of the tank it turning blackish gray. The tank does not smell and after I do a water siphon, the sand from the bottom comes up and I see the color change. After about 12 hours or so the black sand disappears. Any ideas?

Re: Pool filter sand

Posted: Tue Jan 18, 2011 12:16 pm
by Jombi21
I had the same problem with my fine play sand. I figured it was harmful for the fish, so I would take it out. I barely have any left in that tank. I haven't had this problem with my other sand.

Glad you brought this up

Jom

Re: Pool filter sand

Posted: Mon Jan 31, 2011 9:34 pm
by Jshakour
I decided to post a few pictures of what I am seeing...

This is the what comes up after do a gravel sweep.

Image

And here is a shot from the under side of the tank.

Image

I plan on scooping the black sand out. Can anybody tell me what this is and what caused it? Any good ideas for removing the sand with the fish and some water in the tank?

Re: Pool filter sand

Posted: Mon Jan 31, 2011 9:43 pm
by Jshakour
I found this on Aquariumadvice.com...


Black spots in the sand are indicative of a hydrogen sulfide gas buildup that grows in anaerobic conditions. Stirring your sand periodically will keep that from happening, as well as making sure it's not packed down too tight. It's not usually dangerous to fish unless you have a LOT of it in your tank. Stir sand during water changes and you'll usually prevent it from building up.


I do have about a good inch or so of sand, Ill remove the blacken sand and i will not add anymore and see what happens.

Re: Pool filter sand

Posted: Tue Feb 01, 2011 7:57 am
by Dan Woodland
How thick/deep is the sand in your tank?

Re: Pool filter sand

Posted: Tue Feb 01, 2011 8:20 am
by Jshakour
Dan Woodland wrote:How thick/deep is the sand in your tank?

its about a good inch.

Re: Pool filter sand

Posted: Tue Feb 01, 2011 11:01 am
by Dan Woodland
Jshakour wrote:
Dan Woodland wrote:How thick/deep is the sand in your tank?

its about a good inch.
I experienced the same thing in the past. Since then I use a bit less sand, just below the tank frame, and for tanks that had/have that issue I usually vacuum the sand more regularly than normal. The bacteria/algae etc you see is not harmful to the fish just unsightly and I believe it comes from the sand being densely packed over time where things trapped below the surface rot.

Dan

Re: Pool filter sand

Posted: Tue Feb 01, 2011 11:57 am
by Klaus Steinhaus
Jshakour wrote:Stirring your sand periodically will keep that from happening, as well as making sure it's not packed down too tight. It's not usually dangerous to fish unless you have a LOT of it in your tank. Stir sand during water changes and you'll usually prevent it from building up.
This is the best way to prevent this condition. I like a thick layer of silica sand in my tanks, especially for the Eartheaters like Geophagus and Satanoperca. During my weekly water changes, I take the grip end of a wooden spoon and carefully stir the whole substrate. Since I do this, I never had this problem again.

Re: Pool filter sand

Posted: Wed Feb 02, 2011 10:33 pm
by Jshakour
Thanks for the info!

Re: Pool filter sand

Posted: Mon Nov 05, 2012 7:26 am
by brad3
Nice info always wondered about this

Re: Pool filter sand

Posted: Wed Dec 05, 2018 9:59 am
by ovion21
Jshakour wrote:
Sun Jan 16, 2011 8:41 pm
I have been noticing in one of my tanks that has pool filter sand, the sand at the bottom of the tank it turning blackish gray. The tank does not smell and after I do a water siphon, the sand from the bottom comes up and I see the color change. After about 12 hours or so the black sand disappears. Any ideas?
Hello,

The same thing is happening to me. Is there something about to worry? How you resolved this? Is there need to change the sand? Please help me with this.

Thanks

Re: Pool filter sand

Posted: Mon Dec 10, 2018 12:57 am
by bellamor
Depending on how long the tank has been set up, the black veins could be nitrifying bacteria setting up shop in less-dense pockets of your sand.
If it is anaerobic bacteria, just mix the sand layer lightly to evict them from their homes.

Re: Pool filter sand

Posted: Thu Feb 14, 2019 10:24 am
by leilani1809
Hello,

I'm also facing the same problem and googled lot of related things on internet and finally decided to clean up because i think it is not good for fish. As jambo said that i have also read most of the places. So tomorrow is the day i ll take it out all the sands.
Thanks jambo and Jshakour!