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The best would be to put a T with a shut off valve right after membrane and fish before each use. I'm actually going to move the T I put in to that spot
I recently replaced all my RO/DI filters and membranes. I had similar issue with new dual membranes. Food some searching it said that they can have a "break in" period. I do a membrane flush before each use (have a T before DI) that I run for a few minutes before water to be used comes out...
Maybe dip with lugols/ iodine. Place in holding tank if you have one. Then after a week or so dip in coral dip or hydrogen peroxide (check amounts and time for different corals). Add back to holding tank, but with fresh batch of water. Give a week or two then add to main display
Biggest concern is the type of plastic is made of. Make sure it won't leach out anything. After that it would be sturdiness, but that looks pretty solid.
Also with that lid you could theoretically just cut out holes for plumbing and load a bunch of rock to grow non photosynthetic sponges.
Get the Tropic Marin Pro hydrometer like mentioned above. I have a refractomter, 2 pinpoint salinty monitors and my Apex probe. They would ask read different even after calibrating. Went with the Hydrometer and only use the other stuff as a quick reference