If the clunk is $14 and the tank is a few dollars more, I guess I would spend my money on a bladder tank instead. The Tettra at
www.pspec.com comes in 4 oz, 5.25 oz, and 6 oz sizes for less than $20. Great tanks, that cannot foam because no air is in the system.
You will need a syringe though, I wouldn't waste your time on the cheap ones, buy the Jett Tanker at
www.jettengineering.com . Its the largest, easiest to use syringe you can buy.