A highly active and intelligent North American native fish. Known for their deep, laterally compressed bodies and the distinctive dark spot at the base of the dorsal fin. They are predatory and territorial, often treated as 'coldwater cichlids' by hobbyists. Because they grow large and are highly active, they require significant swimming space and heavy filtration.
Bluegill Sunfish At a Glance
Bluegill Sunfish Tank Requirements
Will Bluegill Sunfish fit in your tank?
Care guides tell you what Bluegill Sunfish needs, the next question is whether your tank can safely provide it. Test Bluegill Sunfish against your tank size, maintenance needs, and the fish you already keep before you buy.
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Bluegill Sunfish Water Parameters
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Bluegill Sunfish Temperament & Compatibility
Bluegill Sunfish Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard Adult
Full-grown adult. Highly territorial, especially males during breeding season. Will eat any tank mate that can fit in its surprisingly large mouth.
Same care requirements as the base species
Also known as: Adult Bluegill, Wild Type
Juvenile (Grow-out)
Young bluegills frequently caught or sold as fingerlings. They are fast-growing and voracious eaters. Can be temporarily housed in smaller tanks but will rapidly outgrow them.
Differs in 4 traits from base species
Also known as: Baby Bluegill, Fingerling
Bluegill Sunfish Care Guide Summary
The Bluegill Sunfish, scientifically known as Lepomis macrochirus, belongs to the Other family group. Adults reach a maximum size of approximately 25 cm and have a compressed body shape with a fast growth rate. Classified as aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a high level of biological waste.
To thrive, the Bluegill Sunfish requires a freshwater only aquarium with a minimum volume of 280 litres and a tank length of at least 120 cm. Water temperature should be maintained between 10°C and 26°C, with a pH range of 6.5–8.5 and a general hardness of 5–20 dGH. A moderate water flow is preferred.
Due to its specialist needs, the Bluegill Sunfish is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Standard Adult and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Bluegill Sunfish Habitat Setup
When setting up an aquarium for the Bluegill Sunfish, a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include smooth gravel or rounded substrate to protect their sensitive barbels and driftwood, which can serve as both a hiding place and a dietary supplement. Keepers should note that expect substrate disturbance, so lightweight décor should be secured.
Bluegill Sunfish Compatibility Notes
Classified as aggressive, the Bluegill Sunfish is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, conspecific aggression can be intense, especially in smaller tanks, territorial behaviour may cause issues if hiding spots or floor space are limited, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Bluegill Sunfish Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Bluegill Sunfish.
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
180 Gallon Standard
350 Liter (120cm Deep)
Show 1 more tank size
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Frequently Asked Questions About Bluegill Sunfish
How big does Bluegill Sunfish get?
Bluegill Sunfish (Lepomis macrochirus) typically reaches a maximum adult size of approximately 25 cm. They have a compressed body shape and a fast growth rate.
What tank size does Bluegill Sunfish need?
A minimum aquarium volume of 280 litres and a tank length of at least 120 cm are recommended for Bluegill Sunfish. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Bluegill Sunfish need?
Bluegill Sunfish thrives in freshwater only conditions with a temperature range of 10–26°C, a pH between 6.5 and 8.5, and a general hardness of 5–20 dGH. A moderate water flow is preferred.
Is Bluegill Sunfish peaceful or aggressive?
Bluegill Sunfish is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Bluegill Sunfish live alone?
Yes, Bluegill Sunfish can be kept singly or in a group. They are flexible and adapt well to both setups.
Does Bluegill Sunfish have any special tank requirements?
Yes. Bluegill Sunfish benefits from driftwood (digestion/hiding) and smooth gravel (sensitive barbels) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Plants That Suit Bluegill Sunfish
These plants pair well with Bluegill Sunfish based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Afzel's Anubias
Anubias afzelii
Anubias Barteri
Anubias barteri
Belinda's Buce
Bucephalandra belindae
Buce Motleyana
Bucephalandra motleyana
Christmas Moss
Vesicularia montagnei
Congo Anubias
Anubias heterophylla
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