You have any DIY CO2 going into the tank? If so, make sure its not yeast/sugar......you'd know if it was though....smells nasty.
Can you take a picture of it?
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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