I think I know what you mean by "crashing the tank" ever since it started dying everthing else started act up.. Now that its no longer in there dying everyone opened up & I did a 25% water change..I think that this is so funny, we have some zoa's but I think I may be allergic, everytime I put my hand in the tank and accidently touch them I always get dizzy and nausious. Not so funny feeling