Quote Originally Posted by leslie
Again if it were something in my water why did it not affect the paremeters in my SH tank? As for TLC it is a product that eliminates toxic NH3 and NO2.
TLC is a bacterial culture used to innoculate new tanks. Since this is an established tank I doubt it did much good. It would not have caused false readings.

Again, I doubt you will ever detect whatever caused the crash with a test kit if it was chemical. It could be that one of your corals was sensitive to it and caused it to die and that resulted in a chain reaction. Corals can release a lot of toxic stuff when they die. It may not have been a toxin at all. Some bacteria or physical condition such as temperature may have begun the crash. After the initial die-off, it could have just been like a snow ball effect. There are just to many what ifs in a situation like this.

Why didn't it happen in the SH tank? Who knows? How many corals do you have in there? How many of those corals were the same as those that died in the other tank.