Parameters aren't right

joshuacohenjc

Reefing newb
over the past 3 weeks, ive noticed that my corals are dying. i lost a huge christmas tree favia. 2 open brains, all my candy canes, and all my acans. i also lost one of my gonaporas and the other is dying. 2 of the 7 heads on my hammerhead arent opening either. i asked the local fish store to see what they thought. they told me to test my Ca, Kh and Mg. this is what i got.
Calcium - 505ppm
Alkalinity - 4.9 meq/l 13.7dKh
Magnesium 1400ppm

my tank has also been infested with mini feather dusters. ive also notices im starting to have some bubble algea but not much.
 
You also need to check for ammonia, nitrates, and probably phosphates.

What's your filtration like and are you using RODI water?
 
for filtration i use a Fluval 405 canister filter (only carbon, nothing else inside). i have the bubble magus skimer and i do use RODI water.
i will check the other parameters when i get home
 
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