I had a glass heater break when I was out in my 24 gal nano and when I got home in smelled horrible and was still sputtering in the tank. All of the life in the tank was completely wiped out, luckily there was not much in there at the time because it is a new tank. The question is should I replace the rock and sand completely or wash it out with RO water? It may not be worth the risk with such a small tank, but I thought I would get some insight.