Can i use the 2 liter bottle DIY Co2 in my 5.5 gallon? im not sure if i should use the larger bottle or smaller bottle because ive read in the forums that it is very hard to OD co2 with DIY. Can i use a wooden diffuser and suction cup and put it under my power filter to suck up the bubbles? or is that not going to work? i don't want to make those reactor things because i have no space in my tank. Right now i have a 1/2 liter bottle available, but i don't think that will work too wel? should i go with the 2 litter bottle or is there a better alternative like those fat juice bottles? if i did use a juice bottle (the thick ones) would i need to modify the yeast/sugar mixture and by how much?