)20 inches! wow they grow em big where you live!
pl*cos are a good fish to help clean your tank, and ive only seen them about 8-10 inches, but i guess they could get bigger in a large tank. ive had two in my 55 before and they only got 6 inches long. (which is still pretty big.)
what size tank do you have. there are some plecos that are more colorful or stripey than common pl*cos and they dont get as big. zebra plecos are lovely to look at, but the price is a little steep (20-50 buck for one!). the price is why i havent picked one up yet, and common pl*cos only cost around $2 a peice.
a 75 gallon tank can run from 60-100 bucks in a store(thats if you get lucky too!
) check ebay first or local garage sales and sale adds, sometimes you can get a whole setup for that price.
you can put alot of fish in with plecos from tetras to cichlids. make sure you give them caves to hide in too, they like it.
hope i helped you out!