Sand sticking to inside of glass? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 09-11-2014, 03:50 AM Thread Starter
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Sand sticking to inside of glass?


In my blackwater tank, sand seems to be sticking to the inside of the glass? Or something is? I have to wash the inside of the glass to avoid the cloud on the glass. Is that tannins? Humic acid? Sort of looks like some sort of sand but who knows.

Anyone else running a blackwater tank?

(It would be nice to have a blackwater tank forum on here).

Sorry for weird post.


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post #2 of 5 (permalink) Old 09-11-2014, 05:48 AM
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Sand does not usually stick, unless there is something to make it stick, some sort of gooy stuff.

Very small live animals might look a bit like sand, but cling very well to the glass.
Look up Hydra, for example.

A fine cloudiness on the glass, but you cannot see bits of anything might be certain species of algae. This is usually a green algae, but at first you might not see a color, just a sort of fogginess when you try to look into the tank.
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post #3 of 5 (permalink) Old 09-11-2014, 05:40 PM
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If it was sand you would find it gritty and have likely scratched up your glass by now. Is it possibly a combo of detrius and surface algae? I get that on the inside of my clear pipes, it is tan in color and brushes off easily into a cloud like substance.
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post #4 of 5 (permalink) Old 09-11-2014, 10:51 PM
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might have a bit of biofilm on the glass, and stirred up sand grains are sticking to that?

I've noticed films on my tanks when I drain them, even though they weren't visible while the tank was full, although I don't think I've ever seen sediment getting stuck to them.
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post #5 of 5 (permalink) Old 09-12-2014, 12:46 AM Thread Starter
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Hi: It comes on the tank almost immediately after I pour water in or something - like in five minutes. If I wipe it off it is brown in color. I am doubting it is algae. This is a relatively new tank. It is however a blackwater tank. I did just change out the nasty play sand to pool filter sand (which is soooooooooooooooooo much better so far - I planted something and it did not go everywhere and make a mess like the play sand). I just scraped it and it does look a little like detritus - actually it looks like little tiny bits of peat moss. Hmmm....... dbw
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