How bad is a little rust?

I think that real 316 shouldn't rust in a few days. This brings back memories of a "titanium" heater that rusted to orange-ish after a few days in my tank.
 
Thanks for the topic.

It motivated me to remove the 3 rusting metal clamps on various pumps in my refugium that were rusting on me over the last 2 years. Feel much better having them off and replaced with plastic clamps.
 
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