If you are thinking about buying an aquarium tank for roseline shark, then this blog post is the perfect resource. We will go through tank size, water condition, tank style, tank decoration and substrate. We will also talk about feeding a roseline shark.


To find the perfect aquarium tank for roseline sharks, you must understand their behaviors, their needs. Roseline sharks (aka denison barb) are small, curious & active swimmers. They’re schooling fish that need tank mates. They’re middle level fishes so they can feed on almost any food, even live feed.

They are a very active swimmer that enjoys swimming in groups so they should be housed with other roseline sharks or schooling fish like silver dollars and rainbowfish. If you’re housing them on their own your tank must meet the minimum tank size for its type as it is not recommended to house them alone due to their social tendencies.

Aquarium tank

There are a few tank size considerations when you’re buying an aquarium tank for roseline shark. These sharks need plenty of room to swim and they also enjoy hiding areas around the tank’s perimeter, so it is best if you can buy something large enough that will allow them to do both without becoming stagnant or confined.

At least 5 gallons should be available space in the tank for one or two roseline sharks. So if you’re thinking about having a nano tank, then it should be fine for your roseline sharks.

But roseline sharks are schooling fish, they should be housed together. We recommend at least 6 roseline sharks should be in the same aquarium. For 6 roseline sharks, we recommend a tank of at least 25 gallons tank so that your roseline sharks can swim around freely.

Aquariums typically come as either glass or acrylic tanks. Glass tanks provide better visibility but have some drawbacks in terms of weight and breakability while acrylic tanks are lighter, less expensive, nearly indestructible, but less clear.


Aquarium lighting is usually one of the most basic building block of your aquarium but yet often forgotten. Without proper lighting, your aquarium might be too dark for your tank inhabitants, that may trigger algae build up and affects on your tank inhabitants living conditions.

Tank lighting

You should be fine with default light that came with your tank kit, but we found that those lights won’t be strong enough or last very long. Instead, invest into good planted light from Fluval or Finnex is better option.

Fluorescent lighting is one of the most common types of aquarium lights and provides a full spectrum light that mimics natural daylight, which helps keep fish healthy by balancing out their circadian rhythms.

LED lights are another type of water tank fixture found in more recent years, but they do not emit heat like tungsten lamps or sodium vapor bulbs can have negative effects on tank inhabitants if left unchecked.

Water condition

Roseline sharks (or denison barbs) are sensitive to water. They need pristine water condition (well, like most any other fishes) to survive and thrive.

Temperature inside your tank should be around 72°F – 82°F (22 °C – 28°C) on average. Water pH level should be neutral, that means around 6-8, and best should be around 7. You should always use Deionized Water to put into your aquarium.

Water condition can be tested in a tank through the use of a liquid test kit that you will purchase separately from your tank. You cannot rely on just testing water quality with pH strips because they often give false readings, especially when there are other substances present like chlorine or ammonia. The best way to find out if you have good water is by using an API Freshwater Master Test Kit which comes with all necessary tests for freshwater tank conditions such as nitrates, phosphates, pH levels and more. It’s not expensive at around $25-30 but it’s worth every penny because it’ll keep your fish healthy!

You should also change 20% – 30% of tank volume once per week depending on how much waste accumulates in the tank.

It is best for you to filter your tank water with a good quality external canister or internal tank filter. Filtration systems are necessary because they will remove all of the impurities that accumulate over time and keep your tank clean, clear and healthy!

Do not feed live food if there are any predatory fish in the tank – else these predators may eat other fish when given live food on top of their regular diet which would be uncomfortable for both occupants.

Dionize water can be tricky and expensive. The most common way of dionizing water is through a process called Reverse Osmosis (RO). A Reverse Osmosis system for aquarium tank is typically cost from $50 to whooping $200. If you don’t plan to use RO system, you can opt to use boiled tap water as an alternative.


Roseline sharks require a long line for swimming, so keep that in mind when planning your decorations. A tank for roseline shark should have a clear path for they to swim. However, they’re also a curious small creature, so they tend to find a safe spot to hide in, so put that in mind while planning decorations in tank for roseline shark. Try to make the tank as large possible for them, so they have plenty of room to explore and swim around.

  • Coral: Some people like adding coral in with their tank because it brings out a nice color contrast, but some types may not be safe if you’re keeping roseline sharks. If that is your intention, then keep an eye on what kinds are okay to use inside of the tank before placing any new ones into it.
  • Rocks/pieces of wood: It’s also best to avoid these items too if you want to add something natural looking into the tank; again depending on which type you intend on using could mean whether or not there will be safety concerns when placed within this environment for your pet fishes.
  • Live plants: It’s always best to keep the tank with as natural of a look as you can, so live plants are also a great addition for those who want that appearance.


Typically tank for roseline shark should have several inches of sand, gravel or small rocks as substrate at the bottom with plants grown either inside them. You want to make sure it’s nice and deep so the tank doesn’t look too empty which can be stressful for your roseline shark.

If you’re looking for an example of substrate to use, we recommend using natural moonlight sand since it will warm up faster than gravel if your tank has live rock (the heat from the tank heats up the sand). It also looks more aesthetically pleasing by allowing light to filter through onto plants below it.

The most important thing when it comes to tank substrate is that you make sure not to use any rocks or gravel of a size where they could injure your roseline shark if it tries to move about the tank!

Final thoughts

Hopefully this will help make the process of shopping for a tank for roseline shark easier and less daunting! If you happen to know what type of tank is best suited for your pet before going into store, then be sure to take note of that as well while browsing at the local fish store. This list should also serve as an important reminder about how much time research needs in order to make informed decisions when purchasing equipment (or anything really) so don’t forget to do some preliminary research before venturing out on any new adventures!

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