Calling all Metallurgist!

[WhatCouldGoWrong71]

Anyone good with mixed metals? I’m curious if this poses an issue. I am going to build a frame to support my lighting system. Long story short, if I want to uses stainless steel square tube as the support structure mixed with aluminum square tube. Am I going to have a bad reaction between aluminum and stainless steel long term over a salt water tank? Can I get 5 years?

 

[WhatCouldGoWrong71]

Im guessing I can put rubber between the two metals, the aluminum will be anodized. I just can’t find this exact situation.