Help!! Tank not doing so well..

[kkgmonkey]

Hi there,

Our 85 gallon tank doesn't seem to be doing very well.
We had a water leak from our sump and had to tear it out from under our tank. We had a rubbermaid container as a makeshift. Meanwhile, we completely dried out the sump and recaulked it.
We hooked everything back up, and within a day or so, noticed that the tank wasn't doing well.

About 2 days after the sump was replaced, we noticed one of our five chromis was dead. We then began keeping a close eye on the tank and it seemst that all five of the chromis have now died.
A 50% water change was done, and then two more water changes. Since this past weekend, one of our urchins has lost all of its spikes and seems like it's dead/dying. Our corals (assortment of hammer, frog spawn, suncoral and gsp) are all looking like they might die.

We have four clown fish that seem to be ok, a cardinal and a sand sifting goby. They seem ok. I just noticed a snail was dead, and can tell that the tank is really struggling. Currently experiencing a ton of diatoms as well.. pprobably due to the water changes..

any help would be great as we don't want to lose everything in our tank!! The corals were all thriving and doing exceptionally well.. and now all look like they're on their last leg..

Help!!!!!!!!