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Hi all,

I setup a 10 gallon tank about 3 weeks ago. 1 inch of organic potting soil, sifted, from Lowes, and 1 inch cap of black blasting sand (rinsed thoroughly).

I have small bubble/air pockets I can see throughout the soil layer all around the tank. Is this normal and ok? This is my first Walstad tank.

Water parameters are decent right now: pH 7.5, ammonia 0.25, nitrite 0.25, nitrate 20, GH 7, KH 4

Any thoughts or comments are appreciated. Tank is stocked with pearl weed, bacopa carolinana, rotala rotundafolia, crypt wendtii, dwarf hair grass, floating plants, and two nerite snails (and lots of seed shrimp).

Photo:
 

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Tank looks good!

Substrate is generating CO2 bubbles. Not a bad thing, as long as plants are growing.
 

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Yep, it’s normal. You can use something thin to poke the soil to release some of the air. Something like a skewer or really fine downing works well. Soils can be a bit volatile when first set up, but it settles down after a bit.
 
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