This thread seems to be about big ponds with fish in them.
I have an extremely small pond(s). 150L, 75L. In fact some of these "ponds" are just the largest size Tubtrugs with plants in them
So far, no fishies. I never wanted nor intended to have fishies, since I always understood it brings a lot of extra work.
However, my plants are dying as fast as I can buy them. The biggest problem seems to be that they just rot at the base, float up to the surface, then turn brown and rot entirely.
The second problem which may be linked to the first is that they get covered in very fine strands of green goop, which I believe is blanketweed. It engulfs the plants and may be a factor in their premature deaths.
For the goop I've tried putting little balls of barley straw in all the "ponds", which seems to have done precisely **** all in the 3-4 months it's been in there. Plenty of time for it to work its magic.
Now I'm wondering if goldfish will eat the goopy stuff, and potentially save the plants. I'm tired of buying more and more Hottonia Pallustris (eg) and watching it go from healthy to dead in as little as a few weeks.
I've tried tap water left to sit for a couple days; I've tried rain water. I've tried not having any soil at all (hence hopefully no nutrients!). This green goop grows and fills the available space regardless. It seems to get everything it needs just from sunlight.
I've tried very small containers indoors - jam jar sized. Indoors so the sunlight is much reduced. The green **** grows anyhow, and kills all it touches.
I'd really like to have a nice watergarden, even if it only amounts to a few 75L Tubtrugs around the place. But the dying plants and the green goop are ruining it.
Other plants that have died in the same fashion include: Callitriche Stagnalis & Pallustris/Verna; Myriophyllum Spicatum & Verticillatum. All submerged plants - all apparently "easy" to grow. All dead within weeks.
Really frustrating.
So as to the cure.... pond filters alone? The small ones you buy or the ones you build from various grades of grit in an old barrel? Goldfish + filters?
The plants themselves don't particularly like running water, so I want to avoid creating fast moving currents.
I'm also not sure if putting goldfish in a 75L container amounts to cruelty...