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white stuff growing at bottom of thank?


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In my plastic tote tank, I have notice some white stuff that seems to be growing on the edge of the stuff on the bottom, a bit of dead hornwort, some stones, etc. It kind of looks like it settled there. the tote/tub is sitting on a board on a blue frame.

When I tested the water, there was less than 0.5 ppm ammonia, and almost 0 nitrates and nitrites. The tank has a bit of a swampy smell when I lift the cover. I will be doing a water change after I post this. It contains 1 male betta, 2 blue neon tetras that I need to catch and move to the tank with the other neon tetras, and 5 guppies and a few guppy fry. This tank has been cycled for 2 or 3 months. 

This photos are cloudy because it is in a plastic tote, not glass. I will try taking some from the open top as well.

Any idea what this might be?

This is photo from above. the white stuff is on the edge of one of the IAL. the driftwood is covered with snail eggs.


The white ceramic ring in this photo is the same one in the photo above.



Edited by KittenFishMom
added view from above
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