There are generally three options for what to put at the bottom of an aquarium. First, substrate, including clay pellets, rainforest sand, and cosmetic sand, among others. Different substrates are suitable for different types of fish. Second, aquarium plant soil, which is typically used in planted tanks. Compared to regular substrates, aquarium plant soil contains some nutrients that are beneficial for plant growth. Third, pebbles, though they should be small in size. However, they are still not very easy to clean.
- What is best to put at the bottom of an aquarium?
1.1. Substrate: Using substrate at the bottom of an aquarium is the most common choice. There are many types of substrate, including clay pellets, tropical rainforest sand, and cosmetic sand. The choice of substrate depends on the specific needs of the fish. Clay pellets are suitable for many common fish species, tropical rainforest sand is typically used for South American fish, while cosmetic sand is better for Lake Tanganyika cichlids, oddball fish, and others. 1.2. Aquarium plant soil: Aquarium plant soil is generally used for planting aquatic plants. Compared to regular substrate, it provides some nutrients, which help plants grow better. However, it is important to note that over time, plant soil can break down into a powdery form, so it should be replaced periodically. 1.3. Pebbles: Small pebbles can also be placed at the bottom of the aquarium, serving a similar function to substrate. However, the gaps between the pebbles are much larger, which makes it easier for fish waste to fall through. If the aquarium’s filtration is good, this is fine, but if the filtration system is poor, it can lead to water pollution. - Is it okay not to put anything at the bottom?
It is also fine not to put anything at the bottom of the aquarium, which is referred to as a bare-bottom tank. While it lacks decorations, it makes it easier to clean up waste, which is more convenient for fishkeeping. When starting out, people often prefer to add something to the bottom to make the aquarium look more like a natural landscape, but over time, it may be removed. Bare-bottom tanks focus more on the health and condition of the fish.
