Sudden deaths and issues

[will?]

I completed a water salinity correction last week, lowering my tank water from 1.028 to 1.026 over the course of a day. I also added chaeto to my display tank to feed my tang and a relatively large trochus died, which I didn’t realise. This is all I can think of having changed in my aquarium in the past week or so, but my long polyp fungia has retracted flesh around its edge, but looks relatively healthy with fat tentacles, but they don’t extend fully either. Ive moved it off the gravel bed, because I believe this damaged the under coral flesh and caused the recession, but I’ve also had a starfish die this week too. this all seems really strange, all of my tests look good, more calcium than usual, but that’s been the case for a while, and slightly higher nitrates but no excessive algae growth? Also looking to get a magnesium test, just to see if that might be related. Any ideas on cause and treatment?

Thank you in advance

 

[Mr. Mojo Rising]

Sorry for all your troubles but we will need more info, there is nothing in your comment that can lead to death. What are the parameters please list them? How old is the tank? Do you use rodi or tap water? What test kits do you use? And finally, pictures really help, its hard to imagine what people are describing sometimes.... "looks relatively happy with fat tentacles but not fully extended either", see what I mean, how do we imagine this? Full tank pics also help to get the full idea

 

[will?]

Sorry for all your troubles but we will need more info, there is nothing in your comment that can lead to death. What are the parameters please list them? How old is the tank? Do you use rodi or tap water? What test kits do you use? And finally, pictures really help, its hard to imagine what people are describing sometimes.... "looks relatively happy with fat tentacles but not fully extended either", see what I mean, how do we imagine this?

Sure, sorry. I’ll get exact measurements tomorrow most likely when I get a chance but the other answers I have. I use treated tap water to remove chlorine, chloramanes and heavy metals etc., salifert and Red Sea tests, and below is an image of the starfish, he began slowing down about a week or two ago, when I found him in the sand, might have been stuck there?

 

[Mr. Mojo Rising]

There is no picture attached, but do you know what type of starfish it was? There are several types of starfish sold that have poor survival rates in aquariums, its all dependent on the tank size, tank age, sand depth., some fish pick at starfish also so we should know the other livestock in the tank... so again, (sorry to say it) we don't have any info on your tank so its hard to make a guess. Sorry I'm not trying to be a jerk, just explaining why we need so much info

 

[will?]

There is no picture attached, but do you know what type of starfish it was? There are several types of starfish sold that have poor survival rates in aquariums, its all dependent on the tank size, tank age, sand depth., some fish pick at starfish also so we should know the other livestock in the tank... so again, (sorry to say it) we don't have any info on your tank so its hard to make a guess. Sorry I'm not trying to be a jerk, just explaining why we need so much info

Sorry, been super busy recently and didn’t even notice the reply. Tests looked good, nitrate around 10-20ppm, nitrate 0.2 (but that’s just after a big coral feed), ph 8, waiting on phosphate to process. The starfish was a red fromia that so bought full size and had for about a year. I’ll attach a photo of the fungia though, it’s my main concern as my other trochus has knocked it off it’s rock and damaged it again. Just fed it some fish and brine shrimp, seems to eat but not expanding as much as usual. Might experiment with flow a bit?

 

[will?]

There is no picture attached, but do you know what type of starfish it was? There are several types of starfish sold that have poor survival rates in aquariums, its all dependent on the tank size, tank age, sand depth., some fish pick at starfish also so we should know the other livestock in the tank... so again, (sorry to say it) we don't have any info on your tank so its hard to make a guess. Sorry I'm not trying to be a jerk, just explaining why we need so much info

Sorry, been super busy recently and didn’t even notice the reply. Tests looked good, nitrate around 10-20ppm, nitrate 0.2 (but that’s just after a big coral feed), ph 8, waiting on phosphate to process. The starfish was a red fromia that so bought full size and had for about a year. I’ll attach a photo of the fungia though, it’s my main concern as my other trochus has knocked it off it’s rock and damaged it again. Just fed it some fish and brine shrimp, seems to eat but not expanding as much as usual. Might experiment with flow a bit?