what went wrong

[whistlerskipro]

OK To recap.
The 40lbs of coral I added was dead coral used as more base rock to increase total LR to 1.5lbs LR per gallon for 55gallon tank.
Ammonia 0
Nitrite. 0
Nitrate. 0
Phosphates 2.5

So tank never crashed in the since of loss of fish invertebrates or coral

Actions taken 50% water change
Covering aquarium for 48 hours
Anything else?

Thanks everyone

PS you can see the 40lbs dead coral in the picture, thought it would look good.
Reason for braking it up to get more water flowing through the tank.