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Is that chemi pure blue? I'm assuming cuz of the white resin I see in the bag.
Suggestion: I would remove the purigen for now as that plus chemi pure will strip your tank down to 0 really quickly in that empty tank. The combo of the 2 long term may cause you more headaches down the line.
You...
Once you have a good starter, the pods will repopulate on their own. When you seed the tank, do it when the lights are off to limit the chances of them getting consumed by fish n what not.
You can make your own pod hotel as from the pix, it just looks like corrugated plastic sheets just glued...
You're more likely to have better success with a larger tank as the parameters will be more stable but....if it's not working out for you, ditch the corals and keep the nems, they seem to be doing well in your tank. Maybe do a clown harem in your tank
Use the bottom of your collection cup as a guide. For now, keep the water around the lip of the skimmer where the body meets the cup. When it fully breaks in, probably after your cycle, you can play with the air intake to skim wet or dry
That model skimmer has a water line marked on it and you have up a 1" play on it. For now close the air to the skimmer until the water in the skimmer is bubbling just below the neck in the collection cup.