So if you do weekly or monthly water changes of say 25% you'd be fine?

We really should have a few tests tanks setup to determine how quickly Bromine/Bromide can dissipate. But there would be tons of variables.

Bromide is tough to measure in seawater. There is an electrode available, but it is $800.

I see...what about monthly water changes? You'll be fine, right?

I couldn't say that for sure, no.

Forgive me, My chemistry is highly ferric oxidized. Are there any media that might absorb the bromide? or safely preciptate it out? If so, one could mix a bottle of calcium chloride solution and condition that first before adding to tank or water change mix. A poly pad perhaps?

Algae, macroalgae, and other organisms might rapidly deplete it, and carbon and skimming will export it when incorporated into organic forms, but there are no media sold to hobbyists that bind bromide. :)