Balancing your pond

Question:

Can I put goldfish in the small ponds in my yard?
I have three or four small ponds that measure anywhere from to four feet across and a foot, foot and a half deep. I want to clean them up this summer and make them look nice and I thought some fish would be a nice addition.

Answer:

These are a few pond rules to know. Makes pondkeeping easy.

Balance your pond ecologically. Use bog plants like irises or umbrella plants. You must have oxygenators or submerged plants. The best is anacharis, followed by cabomba and hornwort. You must have one bunch of these submerged plants per square foot of pond surface. These plants arrive with a rubber band holding them together. Remove the rubber band before you put the plants in your pond. If you don’t want them floating freely, you may pot them up in several pots that sit on the bottom of your pond. The submerged plants are fertilized by fish waste and CO2, a fish byproduct. The fish eat the submerged plants, but they grow faster they the fish can eat them. Nice cycle, huh? Nature takes care of itself if we can j ust leave her alone. If you have too many fish, they will eat all your submerged plants and you have to start over again. A good rule for fish load is 1 linear foot of fish per 25 square feet of pond surface area; tails don’t count. If your pond gets green, have patience. It will fix itself


When pH gets on the basic side algae flourishes. Vinegar is weak and it takes forever (days) to neutralize. But it takes an expert to use muriatic acid properly, so do not put concentrated muriatic acid in your pond to balance pH unless you know what you are doing. You can buy commercial products, usually called pH down or some such. They are expensive, but work well.


It is good to have algae slime on the sides of your pond... this is a sign of a healthy pond and can generate up to 70% of the oxygen needed for your pond.


If you feed your fish, these simple ways of keeping your pond clear will not work. You will need a filter, preferably a biofilter.


You must cover at least one half the top of the pond with floating plants. Parrots’ feather is great, as are water hyacinths, water lettuce and water lilies. If you live in the tropics, you can have beautiful tropical water lilies. You must be willing to either sacrifice them in the winter or store them away until warmer weather arrives again in the spring.

Fish feeding, balanced pond

Question:

You talk about Water lilies on your web site are these your favorites or are these the flowers that generate the most questions?

Answer:

Water lilies? Yes, they do generate questions. But more questions are asked about murky, green ponds which leads to talking about submerged vegetation, the most important plant in the pond.  The water lilies are what sells the pond and are great for providing shade, keeping the pond clear and protecting the fish from predators by giving them a place to hide.

Question:

  I know you feel strongly about not feeding the fish in your pond, can you tell me why this is?

Answer:

If you feed the fish, you introduce a foreign substance. A balanced pond has 1 bunch of submerged vegetation per square foot of pond surface. The fish eat the plants, provide fertilizer for them. And the plants provide 02 for the fish and grow faster than the fish can eat it.  If the fish get fed, they grow too big, the bioload gets too much for the size of the pond. Soon you have huge fish, too much fish poop, not enough 02. The huge fish begin to die and all the fish poop pollutes the water. The pond becomes a great example of how we are polluting our planet.

Question:

 How do you go about achieving a correctly balanced water garden?

Answer:

See the last answer: One bunch of submerged vegetation per sf of pond surface area, at least 1/2 of the pond shaded with floating plants, no fish feeding, no run off getting into the pond, no more than 1 linear foot of fish per 25 square feet of pond surface.

BTW, All the previous information is for goldfish ponds only. A koi pond is an outdoor aquarium and must be treated as such with filtration and food.  If you have a koi pond, you cannot have water lilies nor do you ever need submerged vegetation because those little devils eat it like Hershey bars. Even building a koi pond is different from building a goldfish pond.

Ten Essential Pond Tips

1. You must have one bunch of anacharis (underwater grass) per square foot of water surface area. This serves as a natural filter and as food for the fish. It grows faster than the fish can eat it.


2. 50 - 60% of the surface of the water must be shaded with floating plants. Water lilies are great, as are water hyacinths, water lettuce or water poppies. Just be sure to compost them as they multiply and not allow them loose in a natural waterway.


3. You must have fish to complete the balanced ecosystem. I recommend common goldfish. Do not put Koi in your pond unless you have built a koi pond. They will eat all of your plants.


4. Do not feed your fish. They will become too big for the pond and upset the ecosystem. You will have an overpopulation problem and all of your fish will die.


5. Put in one linear foot of fish for each 25 square feet of pond surface area. If you have 100 square feet of pond, you may have 4 foot long fish, 8 six inch fish or 16 three inch fish and so on.


6. Do not allow turtles, crawfish, alligators, ducks, geese, dogs, raccoons, possums, muskrats, nutria or your children to swim in your pond.


7. Do not use chemicals!!! EVER! Add a dechlorinator when you first fill the pond and then when you add more than 10% water afterwards. 


8. Do not worry about pH. It will take care of itself.


9. Remove any dead or decaying vegetation regularly so that ammonia does not build up and foul your pond.


10. Relax. Your pond will generally take care of itself. I recommend benevolent neglect as the best approach to pondkeeping.

For detailed pond information, see my articles at Backyard Ponds with the Pondlady

Balancing the Pond

I get questions about this constantly, so thought it would be a good time to repeat the laws of pondkeeping. Follow these tips and you will have few, if any, pond problems:


First of all, you need to realize that a pond is a living breathing organism that needs little maintenance if it is started properly. If you obey the following 10 laws, your pond will be happy and healthy and in turn, make you the same.


1. You must have one bunch of anacharis (underwater grass) per square foot of water surface area. This serves as a natural filter and as food for the fish. It grows faster than the fish can eat it.

2. 50 - 60% of the surface of the water must be shaded with floating plants. Water lilies are great, as are water hyacinths, water lettuce or water poppies.

3. You must have fish to complete the balanced ecosystem. I recommend common goldfish. Do not put Japanese Koi in your pond. They will eat all of your plants...and they will do it quickly. If you have a koi pond, you have an outdoor aquarium and must treat it as such.

4. Do not feed your goldfish. EVER!! They will become too big for the pond and upset the ecosystem. You will have an overpopulation problem and eventually all of your fish will die. You may break this law, but if you do, you must have filtration in place.

5. Put in one linear foot of fish for each 25 square foot of pond surface area. If you have 100 square feet of pond, you may have 4 foot long fish, 8 six inch fish or 16 three inch fish and so on.

6. Do not allow turtles, crawfish, alligators, ducks, geese, dogs, raccoons or possums to swim in your pond.

7. Do not use chemicals!!! EVER! Add a dechlorinator when you first fill the pond and then when you add more than 10% water afterwards.

8. Do not worry about pH. It will take care of itself.

9. Remove any dead or decaying vegetation regularly so that ammonia does not build up and foul your pond.

10. Relax. Your pond will generally take care of itself. I recommend benevolent neglect as the best approach to pondkeeping.