On May 5, 8:00 pm, Chip wrote:
San Diego Joe wrote:

wrote:

Hi everybody!

I've been a keen freshwater aquarist for over a decade but I'm totally
new to outdoor ponds and I'm not sure whether the pond that our
landscape gardner is currently giving the finishing touches to is
actually suitable for fish.. a few words of wisdom from the experts in
this group would help me decide whether it's worth getting my hopes
up..

I'm interested in keeping Koi, but even a cursory glance over the
literature is giving me second thoughts about a few issues. Here's a
description of the pond:

Size: about 8 x 8m (24x24 feet)

Depth: around 50 cm ( 2 feet)

It is built with a liner on top of a generous layer of sand and the
sides are made up of a concrete block wall.

The whole thing will be covered by a metal grid to make it safe for
our baby. This should be placed an inch or so BELOW the water surface.

The gardner has already installed a fairly hefty multi-chamber filter
of (very) approximately 300L (60 gallon?) and an ultra-violet unit.

They've also currently planned a series of fairly powerful underwater
green lights.

A lot of things give me concerns there and this was clearly never
planned as a Koi pond..

1) depth: is it at all deep enough to keep koi or any other fish?
Definitely not deep enough for Koi. You could keep gold fish though.
The filter will obviously be kept running during the winter months and
I imagine that this will help with the freezing. I also wouldn't mind
heating part of the pond with an immersion heater, but it might yet be
too shallow for a Koi and/or winter. I live in Luxembourg between
Germany and France, so we don't have Scandinavian winters but
temperature do occasionally drop under -10C.

2) metal grid/ child safety

Are Koi surface feeders? would I be able to feed them properly? will
it stress the fish?
Can you mount the grid above the water? Most fish pellets float. This ma
kes
it easier to remove uneaten food and avoid contaminating the water
3) lighting during the night?

I'm not sure yet how strong this lighting will really turn out to be,
but is this a problem for Koi?
My fish don't seem bothered by lighting, although I only have it on when
I
am there to watch. Don't want to provide predators with an advantage!

If the water won't freeze all the way to the bottom you should be okay,
as
long as you can keep a whole open through the ice.

San Diego Joe
4,000 - 5,000 Gallons.
Koi, Goldfish, and RES named Colombo.

Perhaps a radical idea- Could you hinge the grid (either on one side or
both sides to open in the middle)? This would allow you easy access to
the pond for cleaning, feeding, and netting. or any other means to
easily move a section out of the way like a trap door.

Too late. Gardner's got the stuff already, just haven't seen it yet..

Even more radical- Could you use the grid itself for heating? Perhaps
with a low voltage source.

Wow. Those are some neat ideas but I don't think I'll try my hand at
electricity + water until I'm a bit of pro :-)

You didn't mention a bottom drain or a skimmer. Both seem to be high on

koi ponders' lists of things I SHOULD have done.

Yes, I've seen the stuff on the bottom drain and/or skimmer, but I'm
afraid the liner's in already.

I think next time I'll be better prepared :-) This time over, I just
got the idea of keeping fish in the pond when I saw that the gardner
had already put a decent filter in.. so why not?