Very low Calcium levels

[windcoast reefs]

Originally Posted by daplatapus

A couple quick questions come to mind:
What salt are you using?
What are you dosing thus far, how much and when?
What's your tank size (total water volume) and composition (sps, LPS, clams etc)?

Ive been using instant ocean for the last year and a bit, and I do water changes every week (25 gallons)

Im dosing seachem reef advantage (approximately 12 teaspoons in 1L) and brightwell alkalin8.3 (14 tsp in 1L) spread out over 1 week. Also I use a low concentration of kalkwasser in my ATO to even out any alk swings.

It is a SPS based tank, and I have only manually dosed in the past. 80% of my corals are still frags.