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First Post and looking for some advise.

Discussion in 'General Aquaponics discussion - Aquaponics system ' started by Shane75, Oct 6, 2018.

  1. Shane75

    Shane75 New Member

    Mar 17, 2017
    Hi everybody, this is my first post and looking for some advise.
    I am a newbie I guess in the scheme of things. I started my first build a couple of years ago and have built a CHOP mark 2 system as per Murrys' plans. 1000L IBC for the fish tank and 2 cut down IBCs to form the 3 grow beds and sump. The grow media is 20mm river pebbles approx 300-350mm deep.

    12 months ago I added 50 silver perch to the system, I did unfortunately lose a number of them to begin with, (27 loses in total). I put that down to having a very high Nitrate level, over the period of a couple of days I did many water changes and got the level right down. Since then I have only had 1 fish loss and that was over winter when the temp dropped quite cold. I live south east of Melbourne.

    Plant growth has been ok, but not as good as I was expecting. Last summer I had a number of different things growing but a lot of them seemed to be quite small. Kind of looked like bonsai veggies, lol. I put this down to not having a nutrient "bank" built up yet. Over the winter I put in some broccoli, leeks and cauliflowers. Leeks went Very well, I still have a few left now. Broccoli also did quite well but very slow growers, then the possums found the romanesco broccoli and demolished them. As for the cauliflower I don't know what went wrong, I think it might be a while before I give them another go.

    Anyway I am getting ready for summer and was thinking that the slow plant growth rate might be due to fish numbers. I might not have enough to feed all three grow beds and was thinking about adding some more silver perch and quite possibly adding another 1000L fish tank. I have been reading quite a bit lately in regards to swirl and radial filters and it has got me a bit perplexed. In my thought process I am thinking that they will be effectively robbing the grow beds of potential plant nutrients. I have also been reading up on anaerobic zones, which I am not sure I completely understand, there seems to be some very different info and opinions out there.

    So I guess the brunt of it is I am just looking for some advise on fish numbers, and I know that is a VERY open ended question, and should I install a solids filter,

    Any advise, thoughts, suggestions would be much appreciated, I can upload photos if that will help in any way,

    Cheers Shane
  2. TonyGrunk

    TonyGrunk Member

    Dec 17, 2015
    Good morning from Canberra - can't really help with the fish numbers except to note that I have been told that around 25 to 30 silver perch are required for my 750 litre tank.

    However, i placed a water heater into my tank the last stage of winter and run it at 17% and my veges are absolutely booming even though my silver perch are still 5cms only. The lady who also runs a similar tank set up has not had the same growth and her temperature has just reached 13%.

    My take obviously is that for teh cooler climates warmer water is a must and the fish are just a bonus - but this is from my very small sample.

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