Clown Fish help!

[skabooya]

you mentioned that there were things missing in your tank that you thought may be dead. This could cause a spike.
Also i noticed you are feeding twice a day. Thats a lot of food in a saltwater tank. This could also cause a spike or water quality issues.
Check the nitrite/ate and ammonia in your tank. There should be none but if something is wrong with this then you have your answer.