Sudden death

[pavcio]

Greetings all
Looking for answers to what might of happen.
Long story short my evo 13.5 is running for 5 months I am still new to reefing .. 4 days ago unfortunately I woke up sad view of sudden death in my tank .
Death ones are : both clown fish and fire fish, scarlet hermit crab, 2 troches snails and for some reason xenia coral.
Survivours: watchman goby, 2 blue leg hermits, nassarius snail and all other corals look great.
Done 2 30% water changes since .
My parameters are being checked every second day and been steady for last 3 months
Sg 1.026
Alk 11
Ph 8.0
Cal 450 -460
Mag 1400
Amonia 0
Nitrite 0
Nitrate 10

Have no clue what happen fish ate normally night before no spots on them
Thanx

 

[Mr. Mojo Rising]

do you have any roomates, anyone go near the tank lately? Whatever happened, I dont think it was your tank, something "exterior" happened for everything to die overnight like that.

 

[pavcio]

do you have any roomates, anyone go near the tank lately? Whatever happened, I dont think it was your tank, something "exterior" happened for everything to die overnight like that.

Thank you .. no roommates but that evening I was out for couple hours and do have 3 kids maybe one of them put thier dirty hand in the tank

 

[Garf]

How are you controlling temperature? Could it have gotten too hot?

 

[pavcio]

How are you controlling temperature? Could it have gotten too hot?

Temp is steady 78.0 to 78.8