Millie is a passionate aquarist who caught the fishkeeping bug in high school and has been addicted ever since. This species is quite vibrant and will add a whole new visual dynamic to any aquarium they’re kept in. As far as aquarium fishes are concerned, coldwater species prefer water that is typically around or below 68° Fahrenheit. With that being said, they can show a little bit of aggression when put in the wrong situation (or with the wrong tank mates). We highly recommend taking some time to do a little extra research into this species before you decide to buy. This is why so many people like them for ponds. In case you want them to be kept in … Because many of the ornamental fish considered to be “coldwater fish” are more accurately eurythermal fish and many prefer temperatures similar to, or even warmer than those preferred by certain tropical fish, the term “coldwater fish” in the aquarium context is essentially meaningless, and often misleads pet owners into keeping fish below their preferred temperature. Fish kept in colder water do move slower, however, and it’s likely that it may affect some of their metabolic functions. Other fish that can tolerate cool water: white cloud minnows, some danios, some barbs, a couple types of loaches. Plecos are originally tropical fish, so most don’t do well if waters fall below 65 degrees F. What is your average pond water temperature, and do you live in an area that has winter? ORIGINS Southeastern Canada and the eastern US, near the Great Lakes; also in Louisiana and Mississippi. Due to their critically endangered status can be a bit pricey and not in stock at most fish stores. However, water and air heat differently. Their bodies are very textured and they almost look like they’ve been rendered by a bunch of polygons. As long as you know their fundamental requirements you shouldn’t have any trouble keeping this fish. In fact, there’s still some debate about their ideal water parameters! They’re compatible with the majority of fish on this list. This is one of the most colorful freshwater species out there. However, this does not mean that they should be kept in cold water. As long as you give them some variety in their diet and provide a solid habitat, Odessa Barbs will be quite happy. Some examples are koi, goldfish, weather loaches, hillstream loaches, many species of barbs, sunfish of the family Centrarchidae, many Central American cichlids, and a variety of other species. These little critters are one of our favorite freshwater catfish species to keep in cold tanks. For example, lake trout, a cold-water species, can tolerate (survive) temperatures up to 70 to 73 °F but has a core preferred temperature range of 46-59 °F. We’ve always said that this species looks a bit like a skinny Pea Puffer. But if we had to choose, this would probably be our favorite! They do great in tanks without a heater and don’t have a lot of funky care requirements. Fishing gets tough in very low water temperatures, but some species such as roach, pike and chub will still feed. They’re very pretty fish that have a neat color pattern. The Bristlenose Pleco has a very interesting look that can’t be ignored. They’re relatively easy to care for and do well in slightly cooler water. As you can see, there are a number of fish that can thrive in cold water aquariums. You can keep them in small and cold aquariums, and you don’t have to worry about their diet or interactions with other fish. We often encourage aquarists to give this species a shot since because they’re such a pleasure to own. They share a lot of the same traits as other goldfish, they just look different. These tine creatures are very easy to care for and don’t need a complicated tank setup in order to thrive. If you’re considering getting some cold water fish for your aquarium, you have a lot of options. These fish will keep things bug-free! This is a type of platy that you don’t hear many people talking about. Simply drop in some plants and you’ll be just fine! The Rainbow Goodeid is hardy, low-maintenance, easy to feed, and tolerant of a wide range of temperatures and parameters. In cold temperature, a Betta fish’s body will become cold, and to preserve the warmth of the body, homeostasis will automatically decrease the body’s metabolic activity. Because of their small size and peaceful nature, you can keep them in large groups and with a wide variety of other species. While they definitely swim, you’ll also see them using their arms and legs to walk around the tank as well. Tiger Barbs. If you watch the Medaka Ricefish swimming with other species, they’ll barely even notice them! Source. This is a very pretty fish that’s hard to get your hands on. In fact, freshwater fish can experience daily temperature swings of 30°F or more. The Axolotl is an interesting creature that has rapidly grown in popularity over the last few years. Out of all the fish we recommend to our readers, this could be the species we suggest the most. With an ability to thrive in water temperatures as low as 50°F, the Dojo Loach should be at the top of your list for fish that don’t need heaters. This build allows the fish to park themselves on a surface without working hard just to avoid getting swept away. A steady 70-72 °F (21-22 °C) in-door air temperature during the cold winter months should be enough to warm up the water of your fish tank. This is one of the most popular species in the freshwater aquarium community as a whole, and they make great cold water fish. Fish finders can be great for several applications but during the cold weather and cooler water temperatures they can be especially great for a few key reasons. For whatever reason, these fish don’t get the attention they deserve. If you’re looking for a cold water fish that adds a lot of color, we recommend giving these creatures a shot. However, some aquarists like to keep them in tanks as well. In our opinion, this is one of the most enjoyable fish to watch. Spending some extra time to be confident you’re ready and willing to keep them in your aquarium is the responsible thing to do. Caring for them is rather straightforward as well. No, Oscar Fish cannot live in cold water for a long time. The Pygmy Sunfish is a very pretty species that’s one of the best fish for cold water aquariums. As you can see, they can thrive in a wide range of water temperatures. There aren’t very many fish with a bright yellow that can compete with the Sunset Variatus Platy. They’re not very hard to care for and are rather active fish. After all, most of the common freshwater fish need one! They can do well in cooler waters and will happily coexist with a variety of different tank mates. The Clown Killifish is a gorgeous species that has gotten a lot of attention in recent years. What is the ideal temperature for Oscar Fish? These fish are often compared to Neon Tetras since they look rather similar. These fish most likely died from lack of oxygen before becoming lodged in ice. They’re a very mellow and easygoing fish that is compatible with plenty of other species as well. These fish are very active and are almost always in motion. Their interesting pattern and colors make them a great choice for anyone looking to bring some color to their tank. Simply keep them with peaceful fish that are too big to be picked on! This is a fairly low-maintenance fish as well. Because many homes are not kept in that temperature range day and night, these fish require a heated aquarium. Most of the aquarists we know keep a ton of these fish in their tank. For ordinary maintenance of angelfish, a temperature of around 75°F could be considered ideal. Some of them are quite popular, and others are under the radar. This fish is also easy to feed, care for, and even breed. They’re peaceful which gives you a lot of options when it comes to tank mates as well. When you combine this with their ability to handle cooler water they get even more appealing. This makes them great for aquarists looking for a cold water option that doesn’t sit around at the bottom of the tank all day! You can put them in almost any tank, with almost any other species. While there are some elements of their care you’ll need to familiarize yourself with, they’re not very difficult to keep. T… Do some thorough research into their recommended habitat conditions first. It depends on the type of fish you want to keep. But hey, the more, the merrier, right? Since platy fish are originally a species of tropical water, it requires the water temperature to be between 75 to 80 degrees Fahrenheit or between 24 to 28 degrees Celsius to survive. Coldwater fish, in the context of aquariums, refers to fish species that do not require a heater to remain within tolerable temperatures in a typical indoor aquarium. While they’re not overly difficult, there are a few areas of care that you’ll need to be familiar with. This species is not found in very many tanks. Temperature range: 65 – 72°F. It can be hard to spot them at times! 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