Pleco & Bala shark
I have found that Bala Sharks are nice, but very temperamental. When I moved, my 2 Bala's were the first to die. I eventually lost my barbs too. As far as Clown Loaches, I would go with most of the other people that say they are worth more when they are bigger. I, personally like the common pleco's , though. Still have all of 7 of mine and can't let them go. One just passed away last week though and I'm really bummed about that.