Unless he’s doing a water change with fresh water, I don’t think rinsing equipment outside the tank with fresh water would add enough bad things to the tank to cause this. Seems it has to be the lava rock.
What size tank are we talking about? If you mentioned it, I missed it, but The smaller, the quicker to nose dive from impurities.
Sorry to hear this. If it can’t be saved, don’t lose hope.learn from the mistake and start over. Most of us have had a similar crash.
What size tank are we talking about? If you mentioned it, I missed it, but The smaller, the quicker to nose dive from impurities.
Sorry to hear this. If it can’t be saved, don’t lose hope.learn from the mistake and start over. Most of us have had a similar crash.

