sudden death?

[ST3PH3N]

I have a question because im very confused, I have had a neon goby for about 3months that has been perfectly happy. I was feeding the fish yesterday and he was his normal happy self then today I saw him in a hole breathing very hard and now its dead. I recently added two harlequin shrimp and a six line wrasse. I had a bubble tip anemone, 2 false percs, and a mandarin. What could have done this to him?

[BioCube14]

amonia? what does your water look like?

[JimD]

Hardiness: Very hardy, but naturally short lived. They may only live for about a year or two naturally. 3 years is the longest I have kept them.???

[ST3PH3N]

amonia? what does your water look like?

everything is perfect, nitrate is the only one thats not normal but its been like that for awhile now

[ST3PH3N]

Hardiness: Very hardy, but naturally short lived. They may only live for about a year or two naturally. 3 years is the longest I have kept them.???

maybe, idk how old it was when i got it, but it was only about an inch