Sorry, Water Change, not wild caught.
. Try a larger water change (30-50% or 2x 30% a couple of days apart). You're right. Plenty of people manage without DSB
or Fuge (I'm one of them, I have a 120, no fuge and a shallow sand bed). If it is fine like sand then I can't see a reason it would behave differently than sand (anyone have a thought on this?).
You could try turning off that UV
until after your water stabilizes. You may also want to check the nitrates in your LFS
bought water to make sure that you aren't introducing them with the water changes. What kind of filter are you using?
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