I don't want excessive borate, which leaves out Seachem.
I don't want vitamins or anything else organic in my mix (because I doubt their utility, they degrade with time to who knows what, bacteria may thrive on them as I store new salt water for a substantial period, they are totally undescribed with respect to amounts or identity, they are often not naturally present in natural seawater at appreciable levels, and because I've occasionally had them mess with my skimmer), so that tosses out some like Reef Crystals, hW Marinemix Plus BioElements, Kent, Coralife, and Nutri-SeaWater.
I don't want excessive calcium (long term use of limewater as I use drives up calcium, so I do not want it starting high), so that tosses out a bunch, such as Kent, Seachem, Coralife and Oceanic.
I won't use certain lines of natural seawater due to excessive metals in it.
That only leaves a few to choose from, such as Instant Ocean and Tropic Marin Pro.
I want to start off by saying that your 675 gallon reef tank looks amazing!! How much would it cost if I set up a similar tank(roughly)? Could I get the dimensions of the 675? I may have to get into your line of work lol. I am just asking these questions because I am trying to get ideas for my reef tank.
I came across the i5 power supplies again whole searching eBay. They do not pull up on every search? Item nber is 220501818389 and the seller is: Wells10104. Good luck,y i5's are still available of you have interest