Question What An Earth Is This

will1221

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I have this yellow build up that has developed over the previous 2 days all over my aquariums interior
f14d3e24f19698151b342ff384117e76.jpg
.
 

kallililly1973

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If it’s a newer set up tank it’s most likely diatoms do the spots brush away easily? If so then that’s most likely it
 

Brenden

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Looks like diatoms.

Harmless micro-organisms.

They're common if you have plants or natural decorations in the tank (such as that driftwood). I noticed in the pic you have plants. I have noticed that I NEVER have any diatoms until I decide to buy a plant. Then they emerge. Just take a brush, go in, and scrub it. I noticed you have them growing on your plants too. They will actually eat away your plants over time, so you don't want them on plants. On rocks, wood, not a major problem.
 

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