Dead fish in a clean tank.

Hi all, I need some help here, please.

I think I did it, due to being stupid. I put a lawnmower blenny and a green
Mithrax crab in the tank without leaving it in the isolation tank for 2
weeks. This LFS came recommended to me by a business associate, so I just
assumed that they sold healthy fish (duh). This was about ten days ago. A
few days ago, my flame angel had ich that went away after 1 day, and then
the blenny died today. Before he died he was doing that "scratchy" thing
that you might see fish do in a tank with high ammonia, where they might
scratch the side of their heads against a rock or whatever. Now, the
Fridmani Pseudochromis has one eye slightly bulging, and has a spot that
looks like a tiny bruise, halfway down his body, on the side with the
slightly bulgy eye.

To compound things, I had one of those cheap floating thermometers in the
tank. 3 or 4 inch glass tube, metal weights in the bottom, very thin red
tube inside to indicate temperature. How, I have no idea, but 2 mornings
ago, it was on the bottom of the tank, because the glass at the top end had
broken. I pulled the thermometer out of the tank, but never did find the
bit(s) of broken glass. The thermometer still read 74 degrees Farenheit when
I pulled it out, and all the "red stuff" (alcohol, I think), appeared to be
in the thin little tube

I have no corals yet, just crabs, snails and a green brittle star. They all
seem to be doing fine.

Here is the water test results, all done with aquarium pharmaceuticals kits.
Inconclusive results below are due to me not being 100% sure of an exact
color match on the comparison cards these kits have.

Ph is between 8.1 and 8.2
Nitrites, Nitrates, Phosphates are all 0
Kh is 125.3
Calcium is 520 (Oceanic salt mix comes too high for a FOLR tank, I think).
Ammonia is either 0 or possibly a tiny, tiny bit above 0, I'm not 100% sure.
Its WAY below the .25 PPM color on the card
Specific gravity is a bit low, 1.021

Any suggestions on water parameters, or any theories on why the blenny died?
I saw no obvious signs of disease on him..

thanks, Mike


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