Bad heater?

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Babymama18301

Aquarium Advice Activist
Joined
May 23, 2013
Messages
117
I have a 24 nano cube that had a black and white o clown, orange and white o clown, a cleaner shrimp, a harlequin shrimp, 2 blue/green cromis a few hermits and a few snails oh and a neon goby. A couple corals and a bubble tip nem Early this morning at 330 am the tank was fine and everyone Normal. Back up at 8 everyone was dead expect the harlequin, the nem, corals, hermits and snails. My heater was crack and the temp was unbelievably low and my house was pretty warm so it shouldn't have gone that low. My question how could it have crack? It wasn't moved? And do you think my poor fish got electrocuted? If so how come the corals, nem, harlequin hermits and snails are fine. Water all tested on spot
 
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