So i decided that I need these items to aerate when i do my full boils... i looked on ebay and saw no SS stones... can i just pick em up at a pet store? Also I did see small liter sized oxygen tanks for like 15 bucks at hardware stores... How long do these last? I read 30 seconds per 5 gallons thats GREAT! Should last a while... Ill also need a special tube im guessing to connect... I couldnt find a thread that answered all these relating so specifically to a SS diffuser stone and Oxygen bottle with tubing... or how long they last... shed any light?