at the above rate, no issues with mushies and zoos.
The whitening I am refering to is basal whitening of acros. (Just small areas). If you notice some, stop for awhile and it returns.
Im not sure of it is directly related, but its not a prob provided you keep an eye out.
It has happened to me a couple of times. The Corals it happened to are still growing like mad and have returned to normal.
It may just be a temporary lack of nutrients when it happens.