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Thread: HOG1 working but not enough

  1. #1

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    Nov 2019
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    HOG1 working but not enough

    I have a 100litre (25g) cube with built in back filter. I use a HOG1 about 3 years now and the tank is barebottom with old live rock.Tank is skimmerless and the filter has activated carbon every month the HOG and extra pieces of live rock . I can't lower the phosphate enough (0,05-0,2) but the nitrate levels are always zero. Most of the time hair algae thrives in the tank rock, glass and pumps, at all levels in the tank, and in the HOG too, where I get thin strings of dark green algae. I tried to feed more(4-5 pinches of flake) with no results in nitrate level, but got a bit cloudy water every time and lost all my snails.There is a happy clownfish and a brittle starfish in the tank.I tried to bring nitrate up with KNO3 but it didn't accelerate the algae growth in the HOG. Tried to clean the rock manually to give advantage to the HOG but the hair algae returned as it was. Switched off the tank lights of periods of months( no corals) and kept feeding and nitrate level climbed up to 20ppm but the HOG didn't grow more algae. When i switched the lights on in the main tank the hair algae appeared again. I tried iron, manganese, and potassium to help algae in the HOG with no significant results.Ca, Mg, KH are fairly stable. Lights on the HOG are 24/7 most of the time but algae grows slower in the center.Should I cut some hours off?

  2. #2
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    Welcome from Greece. A photo with the red light off would help. But yes if the middle has not filled in yet, and if the bubbles are strong and go up the middle, then you can do 18 hours of light.

    Also you should be cleaning often, to get what growth there is, out.

  3. #3

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  4. #4

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    Nov 2019
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    I saw bubble rising from the sides so I cleaned the airline tubing with some vinegar.Thanks for the reply!

  5. #5
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    The whole thing needs brushing off in your sink, under running water, each week now. Go to 24 hours of light and bubbles too.

  6. #6

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    OK.Thank you!I will keep you informed!

  7. #7

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    Nov 2019
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    Hello again and happy new year!! So I went from 18 to 24 hours lighting- the air pump was 24 h anyway- and no significant growth was noted at HOG... So I followed your advice to another hobbyist to remove all sponges and mechanical filtration from the back filter.I left only some pieces of live rock and a handful of pumice stone pebbles that had created a rise in nitrate levels up to 50ppm in the first place.Also half a cup of activated carbon for clearing the coloration of the water.In just a week's time growth in HOG doubled and I started to see more sponges in one of my rocks in the DT!! I was amazed and kept feeding. Now the growth in the HOG is steady and plentiful and coralline algae started to expand in my DT !! Nitrate levels went down to 20 and phosphate seem almost zero in just a matter of weeks. There is some green algae on the glass of the DT, that it seems to me as a precursor for coralline, but no cyano, diatoms or hair algae on the rock, glass or pumps. Also snails are more active now in cleaning the tank. I will slowly increase the lighting period in DT from 6 hours to 10 and report back to you! I clean HOG only with my fingers now every 5 to 7 days and is going great! Thank you!!

  8. #8
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    Nice! Yes any kind of mechanical filter will remove the food particles that sponges and forams need to eat continuously.

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