STU801 bubbles rising will certainly create a current. It will just not be nearly as efficient in relation to the energy expended for same results as properly designed and placed disc diffusers. I'll venture a guess that a home made "pipe" system or even using soaker hoses after less than a year in operation will have even 2% of the efficiency of membrane disc diffusers. Your idea WILL help to some degree. I am just saying you will be better off spending equal money for the membrane disc type system (FAR less work to maintain also)