Hi, It's been a long time since I popped up on here but I have a problem
3 year old BYAP 3 grow bed system, that has been in continous production all that time, healthy long living plants, but the fish are dying!
I have a good growth of algae at the moment but that happens every summer
I have had trout, silvers, goldfish over that time with no issues, having had enough of food fish, the rising temps in October always get the trout before we do
, I thought I would go for Koi.I picked up a 1/2 dozen or so mixed sizes, they did well for a couple of months, so I bought some fingerlings and added those in, they went well for a few weeks, however !!!
The Koi have all died off subsequent additions of goldfish die off 1 or 2 a day
Tested all parameters with 3 different test kits, all good, the only paramter off the scale is GH
Hardness,
The system has always been filled up direct from the scheme water
I set up a smaller tank adjacent filled this with the tap water, and aerated it and pumped it independently before adding it,
Best research I can come up with is rainwater or peat filter?
Howver no rainwater tanks set up, or peat available out here in country WA to filter the water
What can I do to get the hardness down?
Koi dont like high heat, they will be unhappy above 25 degrees and will start floating above 30.