Need some help i keep losing coral

[bonomo53]

So my tank was doing great, till about june when i started losing coral. I lost some sps colonies to rtn, lost a few chalices and now my acans and sps colonies are slowly receding from the base up. I cant figure out what the problem is my params are all in check. I haven't lost any fish just coral. Only thing i can think of is that my t5s haven't been changed in about 11 months. Thanks in advance

Alk 9.6 Dkh
cal 450
mag 1500
ph 7.9-8.1

 

[bonomo53]

i dose cal and alk every night and have been doing this for around 9 months now and haven't had a problem with it until this so don't think it can be an alk swing
phos .25
salinity 1.027

 

[bullysam]

water temp?

 

[Mike&Terry]

i dose cal and alk every night and have been doing this for around 9 months now and haven't had a problem with it until this so don't think it can be an alk swing
phos .25
salinity 1.027

That phosphate level is really high. You really don't want that number higher than .03.

 

[mcarroll]

Borderline bulbs will do it so start replacing them, but I'd also address the PO4 levels. Is the tank fed heavily?

-Matt

 

[bonomo53]

ok so i bought a test kit to double check my phos and they are at 0, which seems right because all sps have great color and pe there just slowly receding from the base up. I have literally check everything don't know what else to do. I haven't changed flow or anything in the tank in the past 6 months. my pink lemonade and red planet are starting to recede from the base up

 

[SeahorseKeeper]

How old is the tank? What are the inhabitants? What equipment do you have? What lighting (bulbs, brand, # bulbs)? The more info you can give the better.

 

[bonomo53]

The tank is around a year an a half old. Its 57 gallon rimless, i have 2 mp10s, bubble magus nac3 skimmer, tek elite 6bulb t5 with all ati bulbs. twolittlefishies reactor with chemipure elite. I currently have a kole tang, potters wrasse, algae blenny, mandarin and two true percs.

 

[Pkunk35]

Sorry to hear about your problems,
I'm wondering what kind of salt you are using?

Maybe nutrients are too low for sps if your phos is 0?

 

[Scoobie245]

What is your no3 level?

 

[Wesley42079]

Try changing the bulbs if all perameters are in check.

 

[Young Frankenstein]

https://www.reef2reef.com/forums/reef-chemistry-forum/98456-copper-reef-aquarium-discussion-2.html

 

[Ike]

When was your last water change? How often and how much do you usually change?