Chemstry with a dead rock

[Mad Reefer]

Thanks for reading.
I have a 14 gallon(noncube)3 years old tank. I have tested the parameters all fine calcium 440; magnesium 1350; ph8; alkalinty is 9 dkh.. My corals won't open all the way they're out but not fully. zoa, green star poylp, birdsnest, frogspawn, and whatever it is caused my only fish blue green chromis to jump :/.. So Im stuck, narrowed it down to maybe three things that are out of my realm of knowledge, researched and water changed to the 3 choices:
Added a 4lb dead rock to my tank(I had 9-10 lbs already) and the bacteria staring to grow on it is causing a reaction I can't seem to understand?
I started mixing my own salt mix, Red Sea, did this 2-3 weeks before the rock was added everything seemed fine..
The ph buffer that I used around the same time as adding my rock from a 7dkh to a 9 dkh and 7.8 ph to an 8 is actually hurting my tank..
Please help I'm stuck at these, the corals all flourished under neath the led set up I had with a crappy Red Sea skimmer by my filter

 

[Reefing Madness]

Dont think its the rock, unless you used a rock thats not supposed to be used in Saltwater.
You didn't give Nitrate or Phosphate numbers, gonna need those, and your SG.

 

[Mad Reefer]

Thanks for the response. Nitrates are not noticeable on the test trip I'll have to go to the lfs and get it confirmed. Phosphates will also have to be confirmed, it's below .25 though. so I have some green hair algae on the
Bottom black part of my heater and on turbo snail. There was some green film algea on 2 glass sides I removed at once that may caused a spike in some reading?

 

[tyler1503]

I'd check the temperature and SG aswell, then do a water change and retest everything.
I don't think scraping that algae would have caused a spike in something. Being a 3 year old tank it should be able to handle what little bit of phosphate and nitrate that bit of algae would have used up.

 

[Mad Reefer]

Following up

Hey guys I would like to follow up incase any one else experiences these problems. I removed the 4.5 lb rock from my 14 gallon tank. I had 11-12 pounds originally. I did my share of 30% weekly water changes and nothing seemed to be helping. So it being a smaller environment the diatoms that were blooming were causing some major issues. The aptasia were dying off along with some of the green hair algea was starting to come apart guess that's not a problem but something to take note of. And my corals seemed to being taking some flak in the chemical warfare that was taking place. Everytime I would go to my LFS to get some of their water, I would get a small bloom of the brown string algae so I do not know if this contributed to the outbreak. So I removed the rock changed water then added a phos guard then a month later my frogspawn is splitting and the birdnest is happy and poylps are out and about and no more string algae. So adding 40% of dead rock, compared to your existing rock, to the tank or 4.5 lbs of rock to 111 lbs of water (4%) you may want to be cautious when you decide to add dead, non live straight to the tank with out precautions.