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You can but not necessary. You can make a DIY kalk dripper with a glass jar
You can also add it to your ato (if you have one) just dump in, mix and allow to settle
Seachem Reef Kalkwasser 500 g / 1.1 lbs | Premium Aquatics
I have a ton extra if you'd like. Free
this depends on what you have in stock but yea for the most part this is true.
The tank is still young IMO so it could take time to see some explosive growth. If everything is ok, alive and thriving then i wouldn't worry about it too much.
If you go all fish, maybe you can do a predator tank Mark, then fill it with just leather corals if you looking for a change.
Like mentioned, let you tank stabilize for now.