50 Gal Pond Problems - The Planted Tank Forum
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post #1 of 5 (permalink) Old 07-23-2017, 12:47 PM Thread Starter
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50 Gal Pond Problems


I'm have a new outdoor pond, and could use some assistance.

I have a 50 gallon pond (preformed plastic) with a TetraPond FK3 Filtration Fountain (325 gph pump). I have two plants so far, a Raspberry Swirl Joseph's Coat (Alternanthera Raspberry Swirl) and a Pink Rain Lily (zephyranthes habranthus robustus) that were purchased as water plants from a local nursery. I have a small Barley Straw Bale to help keep the water algae free.

I've tested the water with Tetra EasyStrips (6-in-1 strips) and the pH, Nitrate, Nitrite, Hardness, Chlorine, and Alkalinity are all just fine. I also have tested the ammonia with an API test kit, and it comes back zero.

We've put a few goldfish in the pond so far, and they end up floating the next morning. We buy a couple more, and they do the same thing, sometimes lasting a day or so, but end up dying overnight. I'm confused what's going on. Could the plants be toxic, since the water is fine and the pump is circulating the water over 6x per hour? Or is there something i'm missing?

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post #2 of 5 (permalink) Old 07-23-2017, 01:19 PM
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Have you cycled it?
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post #3 of 5 (permalink) Old 07-24-2017, 07:37 PM
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How long did you run it after you set it up, before you added fish?

Even if it wasn't cycled the fish should have lived more than a night in 50g of water. Did you temperature acclimate the fish? What are the temp highs and lows?

I'd do a full water change. The lily should be ok. I dunno about the other plant. Sounds like something wrong with your water. Maybe some animal came by and pooped in it.

Don't ask for advice. Ask for information, gather lots of information from different reliable sources. Then use the information to make your own advice.
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post #4 of 5 (permalink) Old 06-30-2019, 06:00 AM
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I would double check the water and temputure
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post #5 of 5 (permalink) Old 07-02-2019, 12:46 PM
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Is the 50-gallon pond (preformed plastic) made for ponds? Check the plastic that the container is made from. You may have
something leeching out of the plastic if it's not made of food-grade plastic or made for ponds. Also, check any containers you
have the plants growing in, the same reason.

Last edited by Ironpaw; 07-02-2019 at 12:47 PM. Reason: Additional information
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