75 gallon crashing

[mulch123]

Thanks Scott, Only problem with removing the sand is I have a sea pen coral that likes to have his foot in about 2 to 3 inches of sand. Would you recommend removing them and treating my other tank with copper and i have been doing 25% water changes for the last week to battle this Ich.


And I have 4 fish in the tank and only 2 seem to be affected by the Ich.
Sail Fin Tang
Coral Beauty Angel
Clown Fish
Damsel
The first 2 are the only ones who seem to have Ich and since using the Ich-X they look like they are declining they also are starting to have cloudy eyes.