the day I came home to find 90 g my full blown reef tank dieing, water was turning into jelly (as strange as that may sound), everything died. Every tube was blocked, corals were all closed and dieing, fish were dead, bristle worms were trying their best to crawl our of their hiding places. . .
What happened, you ask? My dad was curious to see what would happen if he put a live clam under the sandbed. this was weeks prior.
It died, and it's rotting corpse messed everything up.. Had to tear down the tank .