Can Common Pleco Live With Jack Dempsey?
Yes, common plecos and Jack Dempseys share a tank well in 75 gallons or larger because plecos stay on the bottom while Dempseys claim mid-level territory.
Why
- Common plecos are bottom-dwellers that spend most of their time on the substrate or attached to driftwood and glass.
- Jack Dempseys are mid-level to substrate cichlids, so they claim different vertical zones in the tank.
- The temperature overlap of 72-78°F suits both species without compromise.
- pH range of 6.5-8 covers slightly acidic to alkaline water that both species tolerate.
- Common plecos grow large enough that even an aggressive Dempsey cannot harm them once they reach 8-10 inches.
What could go wrong
Common plecos produce enormous bioload as they mature, so upgrades to filtration are critical to maintain water quality in a Dempsey tank.
Gear for a shared tank
Sized for the 75 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.
Fluval 307 Performance Canister Filter
Oversized filtration is what lets you stock two species together without water quality crashing. Rated for a tank slightly larger than the 75 gallon minimum.
Eheim Jager 300W Thermostat Heater
Holds a steady temperature inside the 72-78°F window both species need.
API Freshwater Master Test Kit
Keep ammonia, nitrite, and nitrate in check. Two-species tanks have more bioload and less margin for error than single-species setups.
Related compatibility questions
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