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My 1st brand of Kalk was the Kent marine brand with great results. You can find that in any Petco. It's very "powdery" so be careful not to inhale the stuff.
I usually let it sit for a couple of hours, its usually clear by then. I personally dont test much but it cant hurt if you do. You can always up the dose to a maximum of 2tsp per gallon but any more than that and the kalk wont mix, hence why some some with higher demands go other routes down the...
Just make sure that:
A. You dont suck in the "skim" crust that's ontop of the water
B. You dont suck in the kalk sludge that's at the bottom of the bucket.
You want the clear-ish stuff that's in the middle
I use kalk and have used it from day 1 without issues as my only supplement. I use 2.5tsp per 5 gal of RO.
Edit
This was a straight dump into my ro container and my ato would dose this automatically. Once stirsti till mixed, then allowed to settle for atleast an hour.
Definatley your nitrates are still a bit up there. You wanna wait until that vial is on the yellow side. Check back again on that in about a week.
The clowns should be fine, i would start off with them and let the tank ride out a bit to give it time to stabilize a bit.
Right now, just let it be. Keep monitoring your Nitrates and Ammonia, keep your lights off for now too. You can even keep the lights to a minimum when you get ur 1st fish. Once you start adding corals, then you can set a lighting schedule
With nothing in the tank, you Definitely wanna keep the lights off for now until your readings reach near zero. The last thing you want is for algae to take hold in your rockwork early on.
Once you add fish, when the tank is ready, you'll need to hold off a bit more to allow it to stabilize a...