My last GBTA did this to my 20 gallon.... it looked like it was smoking and the tank was a white out.
I happened to see it just before bed one night and did a massive water change immediately. What is also crazy though... is that once my GBTA did this, my snails also started to breed simultaneously. It was very cool to watch.... just not before bed ha ha!
Thats my guess anyhow. BTA.
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