the filtration will be ine. bioload rules apply the same to coldwater stuff same as tropical SW. coldwater stuff have lower metabolism i believe but it's better to err on the side of caution. just watch your nitrogen levels.
you may want to rethink the barnacles. I was discussing that with someone else on canreef. if you get those small intertidal barnacles, they very well may infest your tank... kinda like the aptaisia of coldwater.
Don't bother getting giant barnacles. I got some experience with these. They die. that simple. they need lots of food that isn't provided in a home aquarium (unlesss you know what to feed. i don't think it's worth the effort) otherwise they will starve. they can quickly foul water but it's hard to know when they die until they're really decomposed. whenever i take these dead shells out of the water, i gag at the smell. thank god those tanks are flow through (plumbed to le ocean) otherwise they would have crashed for sure.
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