I can't tell you how many times I've read warnings on discussion boards about deep sand beds (DSBs) risking a tank crash if the anaerobic layer is disturbed and toxic gases are released. I am beginning to think this is a myth. There is no good evidence for it and very few first-person testimonials. On the other hand, DSB enthusiasts note that they've had them for years or decades with no problem (and lots of benefits, including stabilizing alkalinity).
Are there credible first person accounts of DSBs poisoning their tanks?
Are there credible first person accounts of DSBs poisoning their tanks?