Zoas won't open fully about 2 months

aop

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Hi all, I'm looking for help because I've done everything that I could think of and don't know what to try next. I'm almost 6 months into the hobby. Have a 75g with Led china box lights, sump setup with skimmer and fuge, power head 1200gph, 800gph, and 2 jebao rw-8 wave maker.

I have 6 small Zoas maybe 12 heads on the biggest one, one people eater, pink montipora, todds torch, Xenia, very small green star polyp and 4 very Smal frags of birdnest.

For fish 2 clowns, yellow tang, 5 chromis, tiny blue hippo.

All has been well and corals were growing significantly, torch began splitting, monti almost doubled zoa added heads up until 1.5 months ago. Only thing I can think of that changed is power went out at that time , I was at work so tank didn't have good circulation maybe 8 hours, not knowing that I should and busy with work and college I didn't change water until 2 weeks ago when corals started dying. Before I noticed issue I added hammer and 2 mushroom frags which were not doing well so have to a friend to recover. Monti started bleaching, zoa only open about half way since that power outage. Fish doing great torch seems happy and forgot to mention I have small acan that's really happy. In past 2-3 weeks I did total of 3 water changes and even playing with led lights trying lowering intensity allowing more blue. It was suggestion from friend that's been in hobby for a while. Nothing seems to work zoa still won't open all the way. Monti seems to be stable not bleaching more than it did. I'm also trying to change flow around.

SG 1.025 my last water change I lowered to 1.023 friends suggestion to try. Ammonia nitrate and nitrite all 0. pH is 8.0. Phosphates like 0 (could be the issue?) ca 400ppm. Carbonated hardness 9 dKh

I use ro/di water.

I'm lost and don't know what do i miss my blooming corals. Please help.
 
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twilliard

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If those numbers are correct you do not have any nutrients in the water and your ALK may be too high.
 
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I kind of thought alk too high but I've seen some threads saying should be 8-12 and my test kits states natural seawater is 5-7. If phosphates zero means corals could starve? Is my ro/di water filtered too well? I should I try tap water? I use Api testing kits and refractometer for sg
 
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How do I increase nutrient
 
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Last water change 2days ago I'll redo all levels and post
 

twilliard

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No dont use tap water!
Do you see any algae, fuge?
If there is algae you have po4
Now bring your no3 up by either feeding the tank more (dont overdo it it will increase po4)
You can also dose a nitrate source (i use potassium nitrate)
 
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My display has very minimal algae almost none, just mainly the purple coralline my fuge I have the macro chatoe and some algae there but also very little andi do have fair amount red cyano which is not algae but bacteria sludge ( from my understanding am I right?) interesting U say to feed I've actually been feeding only every other or 3rd day as recommended to me by two local refers in the hobby a while, maybe that's the issue? Po4 was zero I'm doing tests now will post update in few min
 
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So here are the parameters just did them:
Sg 1.023
pH 8.0
Ammonia, nitrate, nitrite all Zero
Ca 400ppm
KH 9 dKh
Po4 is 0
 

twilliard

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Should get that nitrate up :)
I personally dont pay much attention to my po4 it always stays around .014
 
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Thanks, I will try to feed just a little bit more, only time I remember my nitrate up was when I was cycling my tank when I started and I remember reading how nitrates are bad and ammonia and nitrite so I switched to ro/di and now can't get them up lol. Well I remember reading that po4 should be avail very low level don't remember what level, if to high algae blooms and if too low corals starve. My ati test kit as brand new and its liquid kit and results attained by matching colors and it clearly shows 0 on Po4, don't know how exact that is but should be pretty close
 

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Nitrates are needed is some form for zooxanthellae
I keep my tank at 2ppm
Hold on and i will show you how well no3 works
 
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Ok thank you!!' I'm open to any suggestions since I'm at a dead end, btw if my KH too high how don't lower it?
 

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14500483129722143376980.jpg


14500482511491649642644.jpg
 
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Wow that is beautiful!!! I can only dream
 

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If your alkalinity is high just let it fall naturally.
Do you dose?
If not hold back on water changes
 

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