Ive got a 6 inch sailfin pleco and he lives happily with my tiger skin oscar (4 inches) also i have an albino common pleco 2 rams and 2 spotted puffers in my 4ft tank all are happy for the moment but i will have to move some out eventually rams and puffers i think anyway plecos i have in this tank and my other 2 tanks all eat anything and everything that hits the bottom meat or veggy matter
tank 1
sailfin pleco ,common albino pleco,two rams,two spotted puffers and my oscar
tank 2
bigger common pleco,mollies,tiger barbs,gouramis,whiptail cats 2,banjo cat 1,bristle nose pleco,tiretrack eel,neon tetras and glowlight tetras
tank 3
2 small plecos ,3 algae loaches,guppies,1male beta and two females,and a clown loach
tank 4
my babys a lion fish and a porcupine puffer
some tanks are a mixture but all get on and no signs of stress anywhere