Algae and Nirtate Battle - SPS 150

prcardinal91

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I am going through a tough hair algae battle currently and am looking for advice. Here is some background -

In October I transferred an established 75 to a 150 sps dominant. I went through some uglies (hair algae, cyano, dinos) before things settled in and really started to grow again. I ran into a serious dino outbreak when nutrients bottomed out and have since remedied that issue. I also attribute the dino outbreak to a lack of biodiversity in the new tank. This happened in January. In order to battle dinos, I was dosing potassium nitrate and neophos and some bacteria products MB7, dr tims waste away and refresh. I stopped dosing nitrate and phosphate in Feb and started to let my nitrate come down with an end goal of about 5 and phosphates below 0.1. Hair algae was always present but I wasn't worried about it too much.

My issue now is that since my nitrate and phosphate have been relatively low (10ppm and .05 ish) since Feb I still have a major hair algae issue. I typically spend 2 hrs or so every week doing manual removal. Every other day I spot treat with 3 percent peroxide with the pumps off. No more than 15 ml per day. My refugium grows hair algae faster than the sea lettuce and cheato I have in there. It is wild to me how fast this stuff grows in my system. I have a large marine pure brick in the refugium.

I do not want my nitrates at zero so I began dosing potassium nitrate again. At this point I feel like I am dumping gas on the fire. I can pull handfulls of this stuff out weekly. If I dont pull it out it starts to choke out my corals. It is not bryopsis algae. My corals all look pretty good with the exception the the setosa I pictured which I started to notice washing out today. I know the tank is still "new" but I am looking for advice on mitigating this algae. I feel the nitrates get used up so quickly by the algae no other organisms in the tank can use nitrate effectively without dosing.

I have two tangs, 2 urchins, and a bunch of snails and hermits. 8 Emerald crabs. Starry blenny. They eat but they can not keep up.

I am not new to reef keeping but this tank transfer and algae issue has humbled me. My first reef tank was in 2013. Always learning I guess. I will include my most recent ICP results and general params. I appreciate any responses! - Paul

2 part dosing with BRS 2 part
Redsea AB+ daily 20 ml
Benepets once a week
Tropic Marine A and K daily 5ml each

ph - 8.1 to 8.3 - skimmer line to outside air. Refugium light on pm light cycle
Nitrate - Currently zero. Typically 5-10
Phosphate - .04
Calcium - 415
Alkalinity steady 8.4
Mag - 1415
temp 78.5 20220227_154129.jpg 20220227_151700.jpg 20220316_210742.jpg 20220316_205949.jpg 20220306_201129.jpg
 

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Only thing I can think of is reducing the light period. Stay vigilant with the manual removal. GL.
 
I have a 200-gallon system with 33 fish, and I have zero issues with algae (except coralline). My setup:

* 57-watt AquaUV in excess of 90,000 µw/cm2
* 2.0L Nyos Zeo and 1.0L Nyos Carbon/Phosi-Ex reactors
* Nyos Quantum 160 skimmer
* 2x 8x4x4" MarinePure bio blocks
* 2x boxes of MarinePure 1.5" spheres
* 4x 100-micron filter socks

I don't run a refugium, I feed my fish 6-8x daily and I have a cleanup crew of probably 120+ inverts, including 2x tuxedo urchins, 2x abalone, 4x black sea cucumbers, 1x pink and green sea cucumber, 8-10x conches of various sizes, dozens of hermit crabs, a large strawberry and emerald crab and several dozen different types of snails.
 
I ordered some sea lettuce nudis and a bunch of clean-up crew from reef cleaners. Hopefully they will get it under control.
 

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