Somethings deffinetely wrong.. help

[Reeftanker3295]

I have been noticing over the past week or two that most of my corals have been looking bad and my xenia shrunk down to almost nothing. The zoanthids have not been opening but when i fragged a tiny piece off and stuck it in my 10 gallon they open up all the way so something deffinetely wrong with the tank. Anyone know what could be causing this?
PH: 8.2
Nitrates: 0
Phosphates: 0
Calcium: 420
Kh: 14
I have alot of hair algae in the tank, could the nitrates from the algae be killing my corals?
Also Kh is a little high could this be the problem? Help i do not want my corals to all die!

[Neuticle]

Your hardness is way to high. What salt are you using and what method for maintaining pH?

Hair algae is a telltale sign of high nutrients, remove as much as possible and increase water changes, and/or use better water. How much to you feed and what amount of fish do you have?

[Reeftanker3295]

Feed spirulina brine shrimp once every 3 days small amount and make sure its all eaten, i use the LFS' water for water changes and have a tomato clown, diamond goby, and blackbar chromis. How do i lower the Kh?

[Neuticle]

I would let it go down by itself, it should go down fairly quickly if you stop adding buffer for a day or two.

With carbonate hardness at 14 and pH at 8.2, it would seem you likely have a magnesium deficiency. I had the same problem when I used Instant Ocean salt.

You need to check your magnesium content, 1250-1400ppm is acceptable for most of our systems. When I had low Mg, I could add two part all day long any not get my pH above 8.1, but my carbonate harness would keep rising.

[Reeftanker3295]

I dont dose the tank at all though, dont have a magnesium test are they sold regularly at most pet stores?

[Loverotties]

If your LFS sells Salifert then I say yes.Not all makes have a Mag.test kit.

[Reeftanker3295]

If i find that my magnesium is low, how do i raise it back up? I think my time pretty limited the new xenia frag i just put in last night already looks bad..

[Loverotties]

I doubt it's your Mag.What is your salinity and temp?

[Reeftanker3295]

I think my temp has been a little low and dad dropped thermometer so i dont know.. Salinity is about 1.023 I would like to mix my own water but dont have RO filter nor do i have the money to get one.

[ChilisREasy]

IO has almost no mag, ReefCrystals has almost 1400ppm of it. i say its your nitrates, DKH, Salinity..also whats the size of your tank...

Red Sea makes accurate, Easy to use Mag test kits

[Reeftanker3295]

Its my 29 gallon biocube, had the zoanthid frag about a week then all of the sudden my xenia frag and zoanthid frag started not opening up and my xenia frag is shriveled up and i just put another frag in last night and its shriveling up and its not pulsing..

[ChilisREasy]

i ran several Nano tanks..its caused by un-stable water conditions..test your water every other day, over a period of 4 weeks i bet your water is shifting atleast every 3 days..wich will cause any coral to die. this is why i say nano tanks wont keep coral long

[Reeftanker3295]

Planning on upgrading to a 75 gallon this christmas or even sooner. How come everything was fine up until like a week ago then though?

[ChilisREasy]

even SPS corals can live a few months in bad water, soft corals a little longer, how much growth did you see in your corals ?

[Reeftanker3295]

Hm mushrooms are still fine and they grew from 3 heads to 10 heads in 4 months, my top rock with brown zoas is still fine and went from about 10 to about 70 polyps in 6 months, just seems to be mostly my zoas and xenia