Came home to the boy forgetting to turn on the lights on his tank. timer burnt out and waiting to get now one. Anyways, hit the switch and wait for Halide to turn on... as it is getting brighter, I notice his purple dottyback is dead... Great, oh well... then the light kicks on fully and I see it... Pair of beautiful Clarkii clowns, dead. Purple Fire fish, dead. diamond goby, dead. And Lawnmower Benny, BARELY alive. I did a water change the night before. checked levels, they good. Got a new Long tentacle nem, it was/is alive and fine, so no like poison leak, But I did notice, I have a HUGE mushroom, was somehow ripped off the rock, did poison from that somehow contaminate the water? I saved the corals and dipped them in a few mixtures and put them in my display.. and Lawnmower is doing ok in main tank... But that sucks, the boy bought the fish with his own money and he's only 9 so I feel bad. but that's the nature of the game... Needless to say, his 24G nano will be up for sale, in excellent condition, but 2 tanks with my hours is way too hard..