I dont even change my buckets, got the lids on nice and tight and have a hole for net pot(slightly off center) and another hole that i cover with a toilet flapper. When i chage my buckets i use a shop vac with an attatchment that has a smaller hole than the hose(so i dont suck up the roots). It works quite well.and i dont glue my airstones(thats what this thread was about, right?)