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Thread: My journey with the Rain2 Algae Scrubber and my 80G Tank

  1. #31

    Join Date
    Jun 2018
    Location
    Australia
    Posts
    19
    So its been about a month and I thought I'd post another update.

    Overall tank has been doing okay, my 72 day Ich fallow period has come to an end and I have finally added the only survivor, a Blue Tang back into the tank! Over the next month I will quarantine and add more fish again which I hope will benefit the tank health overall with more balanced nutrient load, import/export with increased feeding etc...

    My most recent harvest of the rain2 was ~75grams of squeezed algae, biggest harvest yet. The color has been pretty green lately with little to no yellow, I have also noticed the growth is denser/thicker with 'krinkled' wavey kind of pattern. More like 'turf' I guess. I have been feeding more and will continue to do so as I add more fish. My nitrates seems to be pretty stable at somewhere between 0.25 and 1ppm, but its hard to read, when my current test kit is finished I might change to another brand that has better resolution at the low end. Maybe the Red Sea Pro kit?

    I have reduced the vinegar dose in my kalkwasser from 200ml to 125ml over the last 2 weeks as levels Alk and Calcium have been slowly rising. My Alk and Calcium has been pretty stable at 7.7dkh-8dkh and 440ppm-450ppm respectively for the last 2 weeks at the current dosing (kalk in ATO).

    I have modified my lights spectrum a bit. I lowered overall use of 'whites' both in intensity and duration, and increased overall usage of 'blue' in intensity. I slightly lowered usage of the 'UV spectrum as well as I read reports of it being particularly strong on my particular brand of LED's. (Illumagic Blaze X)

    SPS still doesnt like me, I am still not totally sure of the cause of most of my SPS dying, but I am working on the theory of it originating from instability ~2 months ago. From what I understand SPS lags behind the stress events for some time. Most of my wild colonies are dead and gone or dying and probably not going to recover but fingers crossed. I am hoping to see improvements in my surviving SPS in the next month. Some small glimmers of hope are
    - green monti cap to the right hand side of the bridge in my tank has started returning from what I thought was totally bleached death in the last few days with new color and visible polyps
    - green monti cap to the left is looking great and is growing
    - forest fire digi frag has polyp extension again, although its general color is still 'dark' as compared to what its supposed to look like
    - green dalas frags (I have 2) are both almost completely brown and have been for over a month now, but hopefully they recover - its supposed to be a very hardy acro...

    Everything else, all my LPS is doing great!





    https://i.imgur.com/dr4KL7A.mp4

  2. #32

    Join Date
    Jun 2018
    Location
    Australia
    Posts
    19
    So I thought I would post an update. I now have 6 fish in the tank, 1 blue tang, 1 yellow tang, and 4 dispar anthias. In addition to the clam, coral banded shrimp, blood shrimp, snails and all the coral.

    I have noticed for the last few weeks the algae harvest hasnt been as green and fluffy as it was, instead it darker and more 'dirty'? Also the total squeezed mass has been smaller, around 30grams a week when prior i was getting around 50grams+.

    The tank looks great and everything is doing really well for the most part (even my few remaining bits of SPS are recovering and coloring)

    One thing I have to keep my eye on is that my phosphate appears to be creeping up. Could it have something to do with the Rain2 not running optimally? Or is my nitrate the limiting factor to reducing phosphate or something?

    My water parameters are averaging:
    Alkalinity 8.6 dkh
    Calcium 480ppm
    Nitrate 0.25 mg/L
    Phosphate 0.1ppm
    Magnesium 1350ppm








  3. #33
    Super Moderator
    Join Date
    Oct 2008
    Location
    Santa Monica, CA, USA
    Posts
    9,573
    Typical progression. Nutrients in the water have come down, and there is less to absorb. Yes nitrate might be limiting phosphate, but instead of adding nitrate just double your feeding... probably coral food. If you have a good CUC then the sand should stay clean.

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