help!! fish dying...my coraline has turned white

[BlueWorldAquatic]

Did you move the sand over?

I would recommend Stability help stabalize the bacterias, and AmQuel Plus for the Ammonia (we actually tested prime & AmQuel, and found AmQuel much superior for removing Ammonia Nitrates Nitrites Chlorine & Chloramines)

Silicone can be the issue also, depending if it was mildew resistant