Nano Tank Crashed, Help Please!

[texasmarks]

I really need some expert advice here. Last Tuesday morning my 14gal. nano tank crashed. I had gone out of town the Thursday before and did a water change the day before I left. Everything checked out good on Thursday. When I got home Sun. eve. I noticed a droopy coral. I checked my water Mon. morn. and my salinity was very high. I put in about 16 oz. of water Monday afternoon and monday night the salinity was back down and everything in the tank looked great.
Got up Tuesday morn. and about 1/2 the tank was dead and the 2 fish that were still alive had ich. Everything else died by noon. As everything died I took it out and also did another water test everything was perfect, even the ammonia. I took a water sample up to my fish store they tested and everything again checked out fine. By Tuesday afternoon the ammonia had spiked way up.
I have done 3 big water changes the last being last saturday. also, started add 1/8tsp. of saltwater Biozyme each day. My ammonia has not dropped yet at all. I've never seen ammonia in a tank so high even when I cycled this tank last June.
Something else I discovered it must have been last thursday or friday. I keep a 1/4 cup of Zeolite in one of the chambers I decided to change it out I also had a heater in there when I went to get the bag of zeolite out I discovered the heater had busted.
I have 2 questions, any idea what caused my tank to crash and why is the ammonia not going back down. Thanks for any advice.

 

[NyteGTI]

If your salinity got high enough it may have killed the BB which will cause a massive ammonia spike & you wont have any left to start eating the ammo.

 

[texasmarks]

so now it's been a week and my ammonia is still as high as I've ever seen. Should I let it sit and give it another week to cycle. Do a partial water change or change out all of the water. I'm lost...