Low-to-no maintenance pond in greenhouse
(edited Jan 2nd, no longer trying to go for a largely self-sufficient pond)
I got a greenhouse for Christmas, which, clearly, I'm excited about. I'm going to keep cacti and succulents, which I've always wanted a garden of but haven't been able to keep because they would freeze in winter. I also want a pond, partly as a heat sink to help keep the temperature stable, and partly for cool fish.
I have a 110 gallon pond form, set on the floor of the greenhouse. It has a gravel substrate right now, and I'm thinking of adding in some sand and pecan leaves. Right now, it has some clay pots in it propped up by cinderblocks for marginal plants, plus a sunken pot for water lilies. I'm going to plant irises and reeds in the marginal plant pots, a water lily (with its substrate covered) in at least one pot, and hornwort + duckweed over the surface. Might try a sword plant or two. I also have a bog filter in progress, which will be jammed with plants, and the input is probably going to have a filter pad under it to catch some of the gunk. I'll pull and compost excess of the floating plants as nitrate sinks.
There'll be an auto-feeder over the pond with small fish pellets in it, so they'll be fed daily, and will have plenty of bugs to eat. I'm going to create some heavily planted areas to act as, hopefully, in-pond refugiums for the assorted tasty bugs to breed in.
I'm in Central Texas, so we have summer temps of 100+ degrees, and winter temps don't tend to dip below freezing too often. The greenhouse will be lined with bubble wrap in winter to keep the heat in, so it'll stay above freezing. It's under some trees, so it'll be shaded in summer, and I might add further shade cloth if it gets too hot. I'll do small water changes now and then with a bucket to water the plants, but probably not enough to actually count.
My current stocking plan is (edit) giant danios, potentially some sailfin mollies, and 1 common goldfish. I have 5 giant danios in QT right now, but they aren't going out until I have the greenhouse insulated and it gets a bit less ridiculously cold.
Would a common goldfish be happy on its own? I don't know how social they are, but I really don't want to have to worry about them breeding and overpopulating.
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My current project, a 65 gallon aquarium stocked with vernal pool fauna.
Last edited by Betta132; 01-03-2018 at 05:41 AM.
Reason: Clarification, different goals.