2 fish 4 days

Do you have any thing else in there for flow? Your water surface should have a lot of movement, the primary way O2 gets into our water is via exchange at the surface and that water surface should be very active.
 
my LFS guy just texted me. im going in tomorrow with water and questions. hes pretty nice, and im pretty sure he is refunding me (rare for sw)
 
Wow a refund. that is unheard of. He knows that it will come back 10X when you go back to purchase other things in your tank. that's good business.
 
What pump are u using to pump back up from the wet dry.

It sounds to me like lack of oxygenated water and the fish suffocated.
 
I noticed your pH is 7.8, this indicitive of water that has a low oxygen content or s tank that had not cycled fully.

As a point of reference I have my skimmers pump pumping 300 gph + two maxi jet 1200's (300 gph each) on opposite sides of the tank pointed up at the surface, finally a Koralia 1 (400 gph) blowing across my rocks.
 
put a cheap koralia powerhead in the tank, get some flow going and i bet u will have live fish. Fish need oxygen.
 
an ORP probe. but PH will be a good indicator. low PH can point to low oxygen. I'm sure there's a chemical test kit out there as well.
 
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