Could use some help :/ Issues with some corals.

Anubisxii

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I could use some thoughts on some issues I am having recently. I will start with my parameters

Alk 8.0 always steady. no more than .5 each week. Really its .2 daily the .5 in a week might be a stretch but leaves room for errors on my end via testing. Tested through trident and Hanna checker.
Cal = 440
Mg = 1500 - 1550 (trident and salifert tests confirm this range)
Salinity = 1.025 (Hanna)
Nitrates = 35 - 40 ppm (Hanna HR)
Phosphates = 0.03 ppm (Hanna ULR)
Temperature = rock solid at 78 with .4 swings at most

75 g tank - trigger platinum 34 sump - RSK 300 skimmer - fuge running cheato - TONS of bio filter media

I am having an issue with some SPS corals like Monti's growing some algae. It's a small amount on some recently purchased frags, birdsnest and stylos are fine from same purchase but other encrusting corals are not happy. One Monti bleaching a little around the edges, other has small algae growth in the middle, Cyphastrea is losing some skin, pavona is bleaching or looking pale.

What should I be looking at, that can cause this? I use tropic Marin pro reef salt. Not Turkish box's, weekly or daily water changes totaling 15-20 % weekly. I will post some pictures of the tank in a moment, and pictures of the corals when I am back in front of the tank. I really would appreciate any 2 cents anyone is willing to offer.

Thanks, :)
 

Jekyl

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Nitrate that high would be my first guess. 5-10 is ideal.
 
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Anubisxii

Anubisxii

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I am using 2 red sea 50 led's. I used to run 2 red sea led 50's and an ai prime 16 w/o issues , but took down the 16 after getting a new canopy a few months back.

I get about 150 avg at the sand bed and about 250 near the top of the rock work.

I have it set to 18k. I also find it odd I have a gorgonea ( i am sure I murdered the spelling) and I heard they are susceptible to having issues with algae and it's been fine for months sitting on the same frag rack as the new corals.

I also use 2 2k gyres from icecap and have a comline wave box. Flow is great, so I am not sure if that's the issue.


So my question that I can think of is will nitrates promote algae growth? I thought that was mostly phosphates? I held off on water changes recently because I was worried my phosphates were inching too low.
 
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Anubisxii

Anubisxii

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Here are some pictures.
 

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