I have have a friend thats going to give me a 30g when there bala shark, red tail shark and Plecostomus,sucker mouth catfish,Pleco (all different names it has) (Hypostomus plecostomus) (scientific name) (i want to make shure wat kind of placo it is:) ) the pleco is 10years old ant the two sharks are 3 years old how long do thes fish usually live. Those are the onley three fish thats in it.

bala sharks have a lifespan of 8 to 10 years
red tailed sharks have a lifespan of 5 to 8 years
the pleco you have has a lifespan of 10 to 15 years, but some have been known to live upto 30 years