Phosphates & nitrates swings and SPS color

Carlos Garcia

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Hi all! I have a 75g mixed reef, is around 2.5 years old. Recently, I have seen a browning in my sps corals (I've lost some, started browning then receding) including acropora and montiporas and some LPS. Im doing around 15% water change every week but I stoped doing this in June due to a treatment with fluconazol and bryopsis ( the treatment is already done and bryopsis is gone) but the problem started way before this treatment.

Equipment:
25g sump
Protein skimmer Aquamaxx CO-1
No refugium ( just 2 dual chaeto reactor 24/7)
2 carbon reactors
JBJ artica chiller
2 Radion G4 XWR30 PRO (Overall light intensity is 35%)
1 Vortech MP40
Jebao dosing pump (dosing around 85ml of KH and 100ml of CA daily)
1 Tunze Osmolator ATO dumping RODI + kalkwasser ( just 1 tsp per gallon) with 100cc distilled white vinegar
I also dose manually Acropower (2ml/daily) but since my nutrient level are high, I just stoped that.

Habitants:
- 2 Clownfish
- 4 turbo snail
- 1 Cleaner shrimp
- Hundreds stomatella snail

Current parameters 23/6/18
KH: 9.4
Calcium: 450
Mg: 1400
Nitrates: 10ppm
Phosphates: 0.16ppm ( yeah, 0.16 and not 0.016)

I've been testing my nutrients levels and they seem to swing very much. 3 days ago I tested my nutrients levels (Nitrate: 3-5ppm and phosphates: 0.06ppm). I decided to stop using kalkwasser with vinegar because I think my nutrient levels swings are high due to the ATO not dumping water every single day because it depends on evaporation which varies each day making this carbon dosing not consistent. I wanted to test another method to lower my nutrient levels without depleting my tank from nutrients and causing RTN.

Something I forgot to tell is that, 1 of my Radion AC adapter suddenly stoped working so I only used 1 radion for 2 weeks but today my new AC adapter arrived and installed ;)

Before (Pictures from March-April)
20180113_123036.jpg
. 20180113_123030.jpg
20180406_205336.jpg

Today
20180623_131950.jpg
20180623_131957.jpg
20180623_131901.jpg

What are your recommendations? Do you think the same diagnosis as mine? Any help is greatly appreciated.

Thank you,
Carlos Garcia
 

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