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Joined: Jul 2022
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Hi folks.

Where to start. We moved into a new home about a year ago with a 135,000 gallon pond as best I can calculate.

1/8 acre 5,500sqft 4-5 Ave depth
100ft x 60ft oval
135,000 gallons
Well / rain fed on a slope.
Liner
Fountain
Skimmer
2 airators, the membrane pump type
Waterfall
Not to much natural shade until late in the day.

The prior owner said it was about 8ft at the center, haven’t tested that out yet.

There are a mix of fish in the pond.

Koi, about 12-20? About 18-24in long, the water is murky and I never see them all when we feed.

A few Bass, only caught one big female and a smaller male.

Quite a few Bream, small and large.

A few “Placo” not sure..

And at least one decent Katfish.

When we bought the house there was a leak in the liner which we located and had repaired. At the same time as the repair they added an active skimmer to a waterfall on the opposite side which runs 24/7 filters most of the floating stuff into a basket with a sponge type filter we clean weekly. Also added some plants which the Koi have mostly eaten/destroyed lol…

Our water is pretty murkey, seems to be a mix of light algae and the fish stirring up the bottom with maybe some rain run off. We get some stringy algae around the edges but not to much.

Bought a test kit and last read was:
pH 7.5-8.0
Ammonia 0-0.25ppm
Nitrite 0ppm
Phosphate 0.50

We add extra water via the well which is only to top off up to the skimmer. There is an overflow weir that takes the heavy rain flow away down the slope so we do have a way to change out water. That said the prior owner ran the well nearly continuously to keep up with the leak, which we fixed. We haven’t run the pump to “change over” water yet.

We feed the Koi and other fish as best as we can make out as appropriate per the water temp. http://www.hikariusa.com/wp/feeding-coldwater-koi-basics/

We haven’t yet experienced any major algae blooms or seen any signs of a fish dying. One Koi was possibly killed by a Great Herron but the Koi was huge, about 20in long and looks to have probably jumped out of the pond about 2ft dying of air loss. Can’t really say if it was the birds fault.

The only odd thing was we had about 7-10 regular turtles, none snapping, living in the pond when we moved in. There was a time over the summer when over a period of 3 weeks, all of the resident turtles died unexpectedly, about July. We found them floating on the surface dead. There were no dead fish or other things out of place. It wasn’t particularly hot. The local Koi association said there was what could have possibly been blue algae? We never tested the water. No turtles have returned since.

Long story, long I guess is we’re really would like to ensure we’re taking care of the pond and if possible improving the viewing quality of the water to see more of the Koi. We can’t really see down past 4-6 inches or so.

Some posts here recommend Bogs, others tens of thousands of dollars worth of filters.

We have the space to do set the pond up right.

We’re pretty cost conscious, hard working and like projects. Also would prefer to keep the Koi and other fish as our kids and their friends enjoy catching/releasing.

Thanks in advance and look forward to the groups advice.

Cheers

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Last edited by Foreverunstopabl; 11/30/22 08:40 AM.
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Welcome to the forum.

The muddy water could be from the koi rooting around in the bottom of the pond for something to eat. Do a jar test and see if it is from algae or suspended solids.

If the jar test shows suspended solids and it clears on it's own in the jar, then it's the fish keeping things stirred up. If it's suspended solids and it doesn't clear on it's own, then look at doing an aluminum sulfate/hydrated lime treatment.


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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).
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I have a pond that had regular 5ft-6ft of water clarity. The pond was 90ftX90ft. 8100sqft, It was too clear and that allowed algae and weeds to grow on the bottom in 8ft of water. Knowing what I know about fish and water biology, I in the spring 2 years ago put one 8" koi in the pond. This past year the koi is now 20"-21" long and water clarity all summer was constantly 12"-13" - no more 5ft of clarity. No more algae nor weeds. Knowing this what do you think 4 or 5 adult koi would do to a organic sediment layer in a smaller liner murky bottom pond? Your water clarity problem is due to koi. They are bottom rooting fish who for many hours a day are searching the sediments for food items. Because your pond is in FL and water is warm about all year and the koi search bottom sediments roiling the water almost every day about all day for food. The fewer koi that are in the pond the clearer the water will become.

There are ponds with koi that have clear water. These ponds have extensive, elaborate and very expensive water filtration systems. The clear water koi ponds also almost always have rubber liner or cement bottoms that have minimal or no bottom materials due to extensive types of filtration. Thus koi have little if any bottom materials to roil the water; filtration removes what little sediment that accumulates.

With your current pond conditions you will likely not see algae blooms because the high amount of suspended sediment prevents light penetration to most all the pond bottom and only light gets to shallow water about 12" deep.. Plants including algae need light to grow. No light, no growth.

Get rid of ALL the koi and any other bottom feeding fish and water will quickly clear to 5 ft deep however the pond will be filled with plants and way too much algae due to years of nutrient accumulation and sunlight penetrating to all bottom areas = Lots of plant growth.

Talk to numerous members of your local koi association or operators of clear water ponds with several adult koi and they will tell you what it requires to have clear water with adult koi present. Dirt bottom ponds and koi do not result in clear water. As long as even 1 koi is in your small shallow 0.1ac pond expect water clarity to be not much better than 10"- 12" with your small scale filtration system. However the good thing is with this turbid water, you should not have very much problem with filamentous string algae and submerged bottom weeds.

Last edited by Bill Cody; 12/04/22 01:53 PM.

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