2 months ago, a friend gave me a plant (Anacharis or something) from her plastic guppy pond. It had algae and bugs, etc. but I just rinsed it in warm water a couple times, hoping that would be enough. The plant has since died along with fish... but I have noticed tiny, tiny, a little bigger than needle-point-size bugs?

  • Are these parasites?
  • How can I get rid of these?
  • Will they affect fish if I put more plants in later?

About 99,9% of the tiny lifeforms living in freshwater are totally harmless to fish and most are actually food for your fish.

In your comment you have found them to be cyclops and this is the ideal food for your fish, both big and small.

Here is a little about the dangerous types, even if it unlikely you have any of them in your tank.

Most of the external parasites are too small to be seen with the naked eye, so the first sign of infection is often gray or red skin and increased amount of mucus on the skin.

The other part of external parasites is quite large and easy to see, like fish lice and hookworms.

Most of the internal parasites are harder to see, different types of worms are the most common in the intestines of fish.

Some parasites do attack the gills of the fish, different types of gill flukes; they are hard to see without a microscope, but one can often see discoloration of the gills in infected fish.

  • Dragon fly larva are a common danger to small fish that may be brought to an aquarium by pond plants. They start out at microscopic size ; I removed a couple at 1.5 " long after they had eaten most of my young angelfish. Jan 23 at 20:49

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