Goldfish are extremely common, making them cheap, easy to find and information about caring for them is readily available. With that being said, people who would rather venture into the world of tropical fishkeeping are often left wondering whether a goldfish or two could survive in their tropical tank, and the answer, as with most things, is not that simple.
Goldfish have a metabolism that thrives at cooler temperatures than you would typically find in a tropical aquarium. They are also extremely messy fish, leading to ammonia and nitrate spikes that could potentially kill other fish in your tank. Goldfish are incredibly hardy. With the amount of waste goldfish produce, the water parameters can change constantly, with ammonia and nitrate spikes occurring almost daily, which is fine for the Goldies.
Goldfish have a metabolic rate that thrives at lower temperatures than their tropical friends, who will be healthier if living in warmer waters. Tiger Plecos are peaceful but very territorial, so if you plan on keeping more than one, it is recommended that you fill the bottom of your tank with rocks and wood ornaments, so they can find a place to call their own.
Growing up to 5 inches in length, they have a lifespan of up to 8 years under optimal tank conditions. The closely related Bristlenose Pleco is a great choice of pleco fish, too.
Another peaceful fish that will live harmoniously with most other fish is the Cory Catfish. Being aggressive eaters, these freshwater fish will be responsible for keeping your tank clean, thanks to their love for vegetative matter and algae which can build up at the bottom of home aquariums. With a lifespan of up to 20 years, the Cory Catfish is a communal fish, which strives better when kept in groups of at least 3. In the wild, they will feed on insects, larvae and any vegetative matter that sinks to the bottom of shallow shoals.
You can replicate this by offering them a variety of vegetable flakes, insect larvae, and worms such as blood-worms. Mollies are a versatile fish which can survive in both freshwater and saltwater aquariums if the changes are made gradually.
They are great for beginners because they are extremely hardy, and are not as aggressive as some other tropical fish. Because of the vast difference between each type of molly fish, choosing the right water conditions can be tough. However, all mollies prefer warm water, so a temperature between 25 and 28 degrees would be optimal. In the wild, mollies prefer to eat a plant-based diet, most specifically, algae.
Evolution has slowly turned mollies away from a carnivorous diet, and more towards a plant-based diet, so their digestive systems are designed to digest algae better than most other tropical fish. The optimal diet for aquarium mollies would be algae, vegetarian flakes, and the occasional bloodworm or brine shrimp as a treat, but limit them to once or twice per week, max.
Mostly found in small streams, swordtails typically prefer a plant-based diet, so a tank full of naturally occurring algae will be perfect for them, however, they also do well with live foods from time to time. Growing up to 12 cm in length, and with low demands for water conditions, swordtails are perfect for new fishkeepers.
The optimal water temperature would be between 25 and 28 degrees celcius, but they can also do well in cooler or warmer tanks. In the wild, swordtails would typically be found in fast-flowing water, so if you can emulate this by keeping a strong flow of water somewhere in your tank, they will be grateful and will feel more at home. We have added the Betta to our list of best freshwater fish for beginners because they are one of the most stunning tropical fish you can keep. The long colorful fins will catch the eyes of anyone having a peek in your tank.
Betta fish are also very easy to care for, and they will eat most types of food including fish flakes, blood-worms, and brine shrimp. Because of their huge fins, the Betta would be a prime target for nipping fish, but nipping an aggressive fish like the Betta will never end well.
Ok, now you know what species of fish are ideal for beginner fishkeepers, we thought it would be wise to leave you with a few tips that every aquarium owner should know.
I know this because I have shopped in local fish stores my entire life. I have also received thousands of emails, messages and comments from people who have received dodgy advice too. If you are interested in a fish from this list, or if a fish at your local fish store catches your attention, note down the name and do your own research online. The nitrogen cycle refers to the process in which dangerous substances such as ammonia and nitrates are broken down into safer substances such as nitrites in a new aquarium.
For a sucessful cycle, the presence of good bacteria is required, and unfortunately, the only way for this bacteria to establish is to wait, then wait a bit longer. This is a huge subject and one that every fishkeeper must be aware of, so we have an in-depth guide to check out here , but just keep in mind that the nitrogen cycle is a crucial part of the hobby and must be done before you add any fish into your new tank. Smaller tanks will require more frequent water changes and are much harder to maintain equilibrium and balance with the water paramaters.
Fish create waste, so having less water in your tank will cause the waste to destabilize the quality considerably faster.
The 13 freshwater fish that we just introduced to you are just a drop in the ocean when compared to the amount of fish that can be found in aquariums around the world. We answer all of the questions that you probably have swimming around in your head, giving you the tools and knowledge to have some fun with your aquarium.
Let us know in the comment box below what fish you are interested in keeping in your aquarium. Shakkai, comets are known to be great pond fish because of the fact that they need lots of water to stay healthy.
It could be fine during the early stages, before your fish reach maturity. But you should definitely try to upgrade as soon as possible. I would recommend a gallon aquarium at the very minimum for two comets. Until you can upgrade your aquarium, keep a close eye on water quality! Continue to do your water tests and make sure ammonia and pH levels stay under control. Water changes should be paramount on your to-do list until you can get a bigger tank, especially if you notice any sudden spikes when you do the water tests.
Make sure your power filter is in good working order as well! Some aquarium ornaments also offer additional aeration with airstones hidden within the ornament. Some goldfish can get along with snails but many will view your snails as tasty snacks. Once you can upgrade your tank, you can set up an additional tropical tank with the gallon and keep guppies, African dwarf frogs, and mystery snails together in one tank. I have a similar setup with neon tetras and they get along very well.
First, the water has become very cloudy. Second all the fish are now sitting at the bottom of the tank, not moving around too much except for feeding time. They are all eating-but then they go sitting at the bottom of the tank. Please advise me what I am doing wrong? Should I remove the tetras and place them in a separate tank? The goldfish almost seem traumatized. Thank you. Rita, it sounds like your fish have fallen ill.
Depending on your tank size, it sounds like you might have an overcrowding problem. Ammonia and pH spikes can be very harmful. You should also test the Nitrate and Nitrite levels. Reducing feeding can also make a difference in an overcrowded aquarium, at least until you can upgrade your tank.
If you need to, there are water conditioners in stores that will help lower ammonia. There also could be a chance that your tetras might have picked up something on the way home and the disease was transmitted onto your fish. This way, you catch any illnesses before they affect the fish in your main aquarium.
New fish are generally stressed from handling, and this stress often results in a lower immune system that can introduce them to a number of diseases that will make them sick. So if the new fish does catch a disease, you can treat them quickly without worrying about your other fish getting sick. I have had 3 medium sized goldfish in a 20 gallon aquarium. I just added 2 small tetras and things have gone wrong. Also, all the fish are sitting at the bottom of the tank and barely moving around.
They ARE eating but go to the bottom of the tank directly after eating.
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