Can Alligator Gar and Flagtail Cory (Mrs Schwartz's Cory) Live Together?

Alligator Gar is a semi-aggressive species (7/10), while Flagtail Cory (Mrs Schwartz's Cory) is peaceful (1/10). This notable difference means Alligator Gar may occasionally assert dominance over Flagtail Cory (Mrs Schwartz's Cory).

Large aggression gap (6 points) between Alligator Gar and Flagtail Cory (Mrs Schwartz's Cory) increases stress risk for the more peaceful fish.

In terms of spatial distribution, Alligator Gar prefers the Top (Surface) and Middle (Open Water) zones, whereas Flagtail Cory (Mrs Schwartz's Cory) occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.

Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion.

Worth noting: Alligator Gar is a known jumper, so a tight-fitting lid is essential.

To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.

The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.

Both fish can tolerate a pH between 6 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.

For general hardness, the shared comfort zone is 8–12 dGH. Regular testing will ensure conditions stay within this range.

To house Alligator Gar and Flagtail Cory (Mrs Schwartz's Cory) together, plan for an aquarium of at least 8000 litres with a minimum length of 400 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.

Specific environmental needs for this combination include: Smooth Gravel (Sensitive Barbels), Sand (Sifters), Leaf Litter/Blackwater. Meeting these requirements will help both species thrive.

Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.