what are the possibilities that could be happening?

I need some suggestions on what could possibly be happening with my octospawn. I have had him for a good 4 months. In the 4-6 months of having him, He has doubled, if not tripled in size. Needless to say, he was small when I got him. He became fuller, and happier looking.

Over the past month or so, I have watched my calcium levels go from 400, down to 250, down to what is now 50. I have tested the same way for as long as I have had my tank up and running (3 years). I have asked for instructions on how to test correctly over the time. I have read instructions, and I see nothing that I am missing/doing wrong. Over the past 3 weeks, I have replaced the calcium test kit, with a new. No matter which test kit I use, the reading is still the same. I have used the BRS calculator to figure out how much I need to manually add to get it up to the desired level. Although, the calculator says I should add 1860ml of calcium chloride, I have not done that. I added about 60ml twice, within a couple days time. Test the water the next night, still no change. I just did a water change yesterday (Sunday). Tested the water tonight, and my level is still at 50. No matter what I do, it isn't changing.

I am refilling my salt water bin now, and will get that back up to the desired temp/salinity level. Once I do that, I will test the water in the bin to see what reading I get. (I use reef crystals, salinity is at 1.025)

All my corals look fine, except for my octospawn. Within the last day, maybe 2, it looks like the octospawn is deteriorating. I am starting to see his skeleton below the head. It's just all of a sudden. First thought was the calcium level.

Second thought was possibly my peppermint shrimp, or emerald crab. No other corals have been touched. It's just the octo. I had a torch coral, and a frogspawn about 2 years ago, and I lost them both rather quickly. When they withered away, they looked exactly the same was as the octo is now.

Until I can figure out this calcium issue, I'm not sure what to do. I have a fellow reefer coming over in a few days to see if he can test, or possibly see what I am doing wrong. I certainly can't figure it out.

I contacted salifert about the issue, wondering if they heard any customers complaining about a bad test kit. They told me no, and that it was operator error. So I quit that fight and proceeded to retest. same results.

Here is a picture of the octo currently, you can certainly see he isn't happy.
Yet, none of the mean is torn, or looked like it has been eaten. As far as I can tell.

 
Mag results?
Alk results?
New saltwater results?
Take a cup of tank water...add 10ml of calcium...test it..see a change?
 
I think I can honestly say I am the idiot. I am ok with being told I misread the final reading. why? As I sat down and was testing the mag, it occurred to me that I was misreading the 0,1 number. I was reading the line increments as 0.1, rather than .01. that changed everything! now everything lines up as it should.

current Mag - 1400 (measured 3 times, got the same reading)
current Alk - 9.3 (measured 3 times, got the same reading)
calcium 455 (measured 3 times, got the same reading)

What are your thoughts?
 
Well, I certainly think something has attacked it. Its struggling to come out. The top half is trying, but the lower half is staying recessed. I think it's the peppermint shrimp. There home is literally right behind the octospawn, within antennas reach. I'll see what happens tomorrow when I check on them.

Thanks for the initial troubleshooting response, although it was my own wrong doing. Sigh
 
I think I can honestly say I am the idiot. I am ok with being told I misread the final reading. why? As I sat down and was testing the mag, it occurred to me that I was misreading the 0,1 number. I was reading the line increments as 0.1, rather than .01. that changed everything! now everything lines up as it should.

current Mag - 1400 (measured 3 times, got the same reading)
current Alk - 9.3 (measured 3 times, got the same reading)
calcium 455 (measured 3 times, got the same reading)

What are your thoughts?

Watch any changes in Alk, salinity, these E type corals hate change so much especially ALK.....
 
Sometimes those types of corals just go downhill for no reason too..
One wave the wrong way can cause it to damage itself internally on its sharp skeleton or whatever..

Ironically I have a big frogspawn right now doing the same type of thing..
He has been out waving/huge for years now but lately just shrunk back up.. No reason I can determine.. My other ones are doing just fine..
 
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