Slight rust on machine screw in return pump

[gus6464]

Cleaning my sump yesterday and upon inspecting my Fluval SP4 I noticed that the machine screws that hold the front face to the pump have some slight rust on them. Should I replace them 316 grade stainless steel or just bite the bullet and get titanium machine screws?

 

[Jas111]

Interested in seeing the response to this from those with more experience. Wondering if it matters because GFO is essentially rust.

 

[GQsmooth]

Either or will work.

 

[mcgyvr]

The screws are probably stainless already and its just a bit of surface rust.. I'd just brush it with a toothbrush and put it right back into the tank..
That little bit is not going to matter at all..