Starry Night Dying

[rk4435]

We have a Starry Night that grew like a beast for over a year but it has been in decline for the last few weeks. It started as a plug and encrusted a good size rock.

The only parameter problem I've noticed recently is Calcium at 360 for two weeks in a row and residue at the top of the tank as if something is precipitating.

Current parameters;
Mag 1400
Alk. 10.3 (was 13 one week ago and I lowered dose)
Calc 425
Phos .01
PH 8.0
Nitrate .5
Sal 1.025

I do a 15 - 18 gallon water change every other Saturday and have roughly 85 gallons of water.

Anything else I need to check? The tank has been up for a little over two years and nothing new has been added in the last 6 months. All other corals and fish seem fine in the mixed reef.

I'm attaching a photo that is a bit distorted due to my LEDs. You will see the areas around the edges that are turning white and dying.
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[snowmansnow]

Go ahead and drag off a part well above the necrosis as an insurance frag


So long, and thanks for all the fish.

 

[snowmansnow]

The alk spike could have had something to do with it.

Just get parameters back in check and steady . Hope it stabilizes

I wouldn't worry too much about low CA. It would inhibit growth, but I haven't seen it cause a case of STN.


So long, and thanks for all the fish.

 

[sewer urchin]

Go ahead and drag off a part well above the necrosis as an insurance frag

Good call.

Once you check out all the usual parameters, not a bad idea to make sure your test kits are up to snuff by maybe have someone double check the same sample of water with a different set of kits.

Also, check out any magnets in the system for signs of rusting.