Deborah is a fish hobbyist and is fascinated by small ecosystems. She enjoys caring for aquatic life, including goldfish.
Substrate or a Bare-Bottom Fish Tank?
The most common method of tank care for an aquarist is to keep substrate in the aquarium. There is much debate over the pros and cons of keeping a tank clear of substrate. While it can be beneficial to the aquarium, it is also sometimes more convenient, depending on the species of fish, to just have a bare-bottom fish tank.
With species like goldfish, it is sometimes cleaner to keep it bare-bottom. Goldfish uproot plants and are messy, so it can be more difficult to keep the substrate clean. Some aquarium hobbyists prefer to have the tank free of objects and any kind of substrate. It can be economical, since bare-bottom tanks require less substrate maintenance.
Here are some tips for keeping a bare-bottom fish tank and still reaping all the benefits of a tank with substrate:
Factors to Consider
Here are some considerations with substrate-free aquariums:
- There is no foundation to place live plants into.
- Fish waste is more obvious.
- They may require more attention and care than aquariums with substrate.
Selecting Which Live Plants to Use in an Aquarium
Live plants can be beneficial to an aquarium, both cosmetically and functionally. No substrate, no problem!
There are some species of live aquatic plants that do not need substrate to thrive in the aquarium. They are known as rhizome plants. The roots may be attached to rocks, decor, and driftwood. The following are three popular rhizome plants:
- Java Fern
Marimo Moss Ball
The Marimo Moss ball is the most convenient plant for a bare-bottom tank. Technically a moss, this plant can simply be dropped into the tank and is a healthy addition for your fish.
The Pothos is an excellent plant for a bare bottom tank. Not truly an aquatic plant, Pothos will still generously remove nitrates from the water. The roots should be placed within the water, as the leaves remain above the surface. A sprig of pothos plant can be used for this purpose. It is not uncommon to find an aquarium completely empty of substrate and objects, with only Pothos placed in the tank. Pothos should be positioned on top of the tank with its roots hanging into the water.
Potted plants are also an option for bare-bottom tanks. Plants like Amazon Sword can be potted and set into the aquarium. Be sure to consider the species of plant, and the size of pot it will require.
Floating plants are a perfect choice for bare-bottom tanks. They require little maintenance. Simply place the floating beauties in the water. Here are some floating plants that are popular among aquarists:
- Water lettuce
- Water Hyacinth
Cleaning and Water Quality Maintenance
One of the most common mistakes fish keepers make is neglecting to maintain the water quality of a bare-bottom tank. Since there is no substrate, many mistakingly think that the tank does not need to be maintained as often. In a bare-bottom tank, beneficial bacteria will not be stored in the base of the tank and can end up in the filter, which poses a problem for some. However, there are work-arounds for this.
For some fish hobbyists, it is considered impossible to keep good water quality with a bare-bottom tank. This is not necessarily true, and you may keep a perfectly clean tank with water changes and a vacuum. An aquarium siphon vacuum is convenient for an aquarium with no substrate and works great for the bottom of an empty tank. Water quality should still be monitored and water changes performed when needed.
Some aquarium hobbyists drop poly filters into the tank to assist with water quality. Live plants assist in storing beneficial bacteria and removing nitrates from the water. When keeping a bare-bottom tank, simply follow the regular cleaning schedule of the aquarium and everything should be fine.
Species of Fish That Do Well Without Substrate
It is important to consider what species of fish will be in the aquarium if you choose to keep a bare-bottom tank. Goldfish, Bettas, and Minnows will do just fine in a bare-bottom tank, but some species of fish need substrate to live a healthy life in the aquarium.
Enjoy Your Substrate-Free Tank!
Those are simple and effective tips for those who wish to keep a bare-bottom tank. Enjoy your little swimmers!
Questions & Answers
Question: Do you have a list of fish that will be ok in a bare-bottom tank?
Answer: The answer to this question may be more complicated than a simple list, each species requires certain requirements with the tank. I will eventually write a hub article on this topic. Most of the time Goldfish, Bettas, and minnows have done well with a bare bottom tank but I encourage you to research the water and temperature needs of each species. Good luck!
© 2018 Deborah Minter
Joan King on September 21, 2018:
Very good tips. I have never used live plants in my aquarium just the fake ones.