greyish stuff on sand

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Richard203

Plecostomus
MFK Member
Jan 19, 2016
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hi recently I just saw some grey stuff on the sand and its more and more now. do any1 know whats these stuff? looks like mold

 
I bet you dont stir your substrate really well each water change???

Coz that from my experience starts when sand substrate is over an inch thick and isn’t stired thoroughly enough creating that mucky gray color from anaerobic gasses froming below...

So either vacum it out and give it a good rinse before putting back in, or stir the whole tank well and do a lrge water change... should sort out the problem...
 
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um it just started last week, I never had these problem before. the stuff is kinda heavy to vacuum it out.
 
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