What is this white substance inside the substrate? - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 01-22-2015, 01:55 PM Thread Starter
Algae Grower
 
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What is this white substance inside the substrate?





I tried looking this up, and while similar topics came up most of them were described as fuzzy, webby, cotton-like which sounds like fungus or algae. Mine was nothing like that. It was like a powder that seemed to dissolve in the water. I first found this about a month ago when I removed a rock from my tank, where the substance was found underneath it. Recently I pulled some plants out, and when I dug the spot where the plant used to be I found the exact same substance. It could be from root tabs, but that doesn't explain how it was found under the rock. What do you think this is?

Sorry for the blurry photo in the first one. Probably should've taken from the side of the tank and not from the top.
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post #2 of 3 (permalink) Old 01-23-2015, 06:09 AM
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If it is powdery and dissolves in water than it is probably a combo of residue from root tabs and minerals in the water. Some water has a high lime content and as the water evaporates it builds up on the tank walls. This can then fall into the water and collect under decor.
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post #3 of 3 (permalink) Old 01-23-2015, 01:09 PM
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Could it be 2 different things?
Under the rock, was the rock disintegrating?
Not under the rock, fertilizer tablet?

Maybe they are both fertilizer tablets, you put one in the substrate, then moved the rock around and it ended up over the tablet?
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