yellow clown goby and milli

[calkrog]

i have had a lime green millepora for a couple of months and it seemed pretty happy with great polyp extension. i then did some water testing and noticed my calcium had crept down to 350 ppm. i then upped it to 425, but at the same time added a yellow clown goby. this goby is hanging out in the mille all the time and now i am not getting very much extension. levels are much better so i figure it must be the goby. any thoughts on this?