Can pictus catfish live with flowerhorns?

Verdict
No

No. Pictus catfish and flowerhorns should not share a tank. No shared temperature. Pictus catfish need 72–79°F, flowerhorns need 80–89°F.

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Pictus catfish 72–79°Flowerhorn 80–89°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 7–7.5Pictus catfish 6–7.5Flowerhorn 7–8
The green band is the pH both tolerate.

Size to scale

Pictus catfish · 5 inFlowerhorn · 12 in0"2"4"6"8"10"12"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

Pictus catfishFlowerhorn
Temperature72–79 °F80–89 °F
pH6–7.57–8
Adult size5.0 in12.0 in
Minimum tank55 gal75 gal
TemperamentSemi-aggressiveAggressive
Swims atBottomMiddle
GroupGroups of 3+One per tank
DietCarnivoreCarnivore

Better tank mates for pictus catfish

All pictus catfish tank mates

Questions

Can pictus catfish live with flowerhorns?

No. Pictus catfish and flowerhorns should not share a tank. No shared temperature. Pictus catfish need 72–79°F, flowerhorns need 80–89°F.

What temperature suits both pictus catfish and flowerhorns?

None. Pictus catfish need 72–79 °F and flowerhorns need 80–89 °F, so the ranges do not meet.

What size tank do pictus catfish and flowerhorns need together?

At least 75 gal, set by the flowerhorn. Add space for each extra fish.