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I've had success with kalkwasser in my ATO. My 120-gallon tank stays at 420 Ca, 8 dKH without much fuss. Just make sure your ATO reservoir is big enough to avoid swings. What's your salinity at? That can throw things off too.


Yo, kalk is legit but sketchy if your evap rate ain't consistent. I ...

soup wrote: ↑Sun Apr 20, 2025 11:59 pm Thanks for the heads-up, everyone. Gonna skip the Gonis for now and maybe try a Cyphastrea instead. Less drama.

Smart move. Cyphs are underrated, and they won't throw hands with your SPS.

Gonis are chill but they pack a punch with those sweeper tentacles. If your SPS are already settled, it's sketchy. My Acro got stung bad when I tried it in my 60g. Maybe keep 'em on opposite sides if you're gonna risk it.