What Is A Tank Crash?

[lou 123]

?

 

[three-fingers]

When everything basically goes tits-up. Usually when something kills the filter bacteria, you get an ammonia spike and then the fish die. The tank goes back to stage one and you need to cycle again.

 

[lou 123]

what are some common reasons for it happening?

 

[SkiFletch]

Malfunctioning heaters, malfunctioning auto topoffs, poor flow and low surface agitation leading to low Oxygen content and lots of things suffocating and dying at once, malfunctioning powerheads, extreme chemistry problems with hard corals, death of poisonous livestock which release toxins into the tank upon death, and more...