One end of tank better than the other?

[gabbys125reef]

The left side of my tank seems to be better for my corals, if I put anything on the right it shrivels up, when I move it to the left it perks right up. The only thing I have on the right is a mushroom that is doing OK. Any suggestions to why it would be different?

 

[up north hermit]

I'd put my money on different current pattern.
My .02
HTH
Hermit