Redcap Oranda Care Sheet



Redcap Oranda, photo by Benson Kua
  • Scientific Name: Carassius auratus
  • Lifespan: Approximately 10-15 years
  • Size: 7 – 12 inches
  • Care: Easy
  • Community: Yes, as long as you have lots of room for them to move around. (4+ ft tank )
  • Lifestyle: Diurnal, active during the day.

Tank Requirements

  • Minimum Tank Size: 45 gallon tank, remember bigger is always better.
  • Water Temperature Range: 68 – 75 °F
  • Water pH Range: 6.5 – 8.5
  • Water Hardness Range: 6-16 dGH

Perform a 10%-25% water change weekly. If you do not have a filter in your tank, do a water change twice a week.

A tank of 4 ft long or longer is recommend for a goldfish as some may reach up to a length of 12 inches. It is said that “they only grow to the size of their tank.” But it is not true! They will most likely become stunted and not live as long when kept in small tanks, which is why it is important that the tank you choose for your gold fish is long/big enough to keep it happy and growing normally.


A hood is recommended as it aids in helping your fish stay in the tank. Also, the hood keeps debris or dust from falling into the tank.

For Lighting: Full spectrum lighting – T5 is recommended.


Every fish and tank is different, so it is important to know what your dealing with. Some fish love a lot of current and others love no current at all like bettas. Some fish tanks are tiny and some are huge. Knowing what you have, or what you are going to have will help aid you in deciding which filter to go with. Check this article here to select which filter you should go with.


Silk plants, live plants, and decorative ornaments may be put into a goldfish’s tank. If choosing to use live plants, be aware that goldfish love to eat plants and may destroy your plants in doing so. Some goldfish keepers buy inexpensive floating plants (i.e. Anacharis) just for this purpose. If choosing to use fake plants, try to use mainly silk fake plants which are smoother for the fish’s skin. Some fake plants are very rough and can scrape the sides of your fish’s skin if rubbed the wrong way. This is just something to take into consideration when going plant shopping. Hides really aren’t needed in a goldfish’s enclosure.


Usually their diet consists of goldfish flakes or pellets. As a treat you might also like to offer some frozen squashed peas, silkworms, or bloodworms. If feeding frozen foods, make sure to thaw the food before feeding it to your goldfish.


The redcap oranda is a type of goldfish, and we all know goldfish are known to eat and poop 24/7, so you will want to go with something that is easy to clean and is safe for your fish. Most people prefer to use sand rather than gravel due to the impaction gravel may cause if ingested. However, if gravel is the way you want to go, make sure to use very fine gravel that will not harm your redcap oranda if ingested or you may choose to use large gravel pieces that can’t fit in your fish’s mouth. River stones are another option you may choose due to the fact that river stones are bigger than the redcap oranda’s mouth so therefore can not be ingested. But have in mind, cleaning will be a lot harder since you will have to manually pick up each river stone to clean the bottom of the tank.


  1. I have 2 redcap 4 red gold n 1 betta in a bowl with small filter last waterwater change is 10 before.after water change my redcap’s body becomes red and both are moving slowly and also fins of all fishes reducing I always prefer blood worms for eat what should I do

    • Hello Rohit,
      Are your fish still having problems? What kind of water are you using for water changes? You need to make sure that you dechlorinate the water. A small tank with poor filtration can cause a bit of ammonia build up. This might be your problem. The more information that you can give me, the more I can help you. And if you can, please provide a picture of your setup.

  2. I had 6 to 8 pcs of redcap and gold oranda but after 1 week i noticed that the tail of all the fishes are becoming red and within 2 to 3 days all the fish has died.I have kept th fish in 5 ft tank with proper filters but still i am unable to keep any oranda fishes. I have tried several times but the same problem is arising.
    Pls Advice.

  3. I have a red cap in my pond with Koi and curious other fish. She has been here for going on 3 years. She appears to winter fine in Central NY State. Her head, however has grown so large that she has to swim sideways to get the floating food because her mouth is so far under her head. . She recently developed a bump or small skin flap on her head. She appears unfazed by it. What can be done. Don

  4. I have two very small goldfish and two red caps(medium size 2 inch) in a 10 gallon tank with a good filter. I do water changes once a week or so. There’s a bubbler in the tank and a few decorations. Do you think this set up is fine?

    • Hello Anna,
      This is fine for now as the fish are still small, but you may want to consider getting a bigger tank in the near future as all of these fish will get bigger and mobility in a small tank may be hard on them.

  5. My red cap oranda is alone in a 2 gallon tank, I just got him about a week ago and he seems sick, his tail has red streaks and is ragid, I had him in with some other fish(fan tails) but I moved the other fish because I thought they were eating him, the problem is that he isn’t getting better, I have a heater and a bubbler and a filter so what am I doing wrong?

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