Royal Pleco (Panaque nigrolineatus)Royal Plecos are large, striking catfish with unique striped patterns and a powerful sucker mouth. They are great algae eaters and add a prehistoric look to any tank. Minimum Tank Requirements: Tank Size: 200 litres or more Temperature: 24 28C pH: 6. 5 7. 5 Tankmates: Compatible with medium to large peaceful fish such as cichlids, angelfish, and rainbowfish. Avoid aggressive species that may stress them. Diet: Herbivorous. They eat algae, sinking