Mag pump

[niger12]

I have notice that the screws on my Mag 3 are starting to rust. I had it out odf the tank for a while but did not notice rust before reinstalling. Should I get it out, will it cause problems. My tang is not doing well the last few days. He is keeping his fins clinched. Has the typical yellow tang brown spots. Water test fine not sure what is happeninig.
Thanks in advance

 

[dreeves]

Somebody mentioned before to contact the mag company and they will send you nylon replacement screws...but to be carefull when installing them as you can twist them off pretty easily.