Help!! IS my tank crashing?

over last 3 months I have been having death of my corals in my tank. But they are not going all at once. I lost my first coral, (birdnest about the size of a softball), once it was gone, then one of my monti's started going, once it bit the big one, another birdsnest went, now another monti is starting to go.
I have had these corals for years, i havent added anything (corals, fish so on.) I do water changes weekly. Water Numbers are all good. Tank is about 5 years old.

 

Have you checked for anything that maybe rusting?

 

My thoughts exactly

 

This is why I like to keep a couple extra Triton kits on hand. Just in case something seems off I can send a sample in to try to figure out what's going on. Might be a worthwhile investment if you have quite a bit invested in corals. Is it possible you have a bad batch of salt?

 

So i found my UV sterilizer was rusting on the inside, and my clamps on my pump to hose, I have no clue what to replace the clamps with.

 

I use zip ties

 

Glad you found that, run lots of carbon and water changes

 

If you don't trust zip ties you can also get plastic hose clamps or titanium clamps. I have a couple titanium ones in my sump on my return pump but they aren't cheap.

 

Nice work fellas!!!