BCC clearos, whether that's a tank or something smaller. Done with cartos for all time..no more over-tight draws, wondering how much juice I have left in there, having a hard time adding more juice when I'm not home. I love BCC's. My favorites are the SmokTech Trophy Tank and the SmokTech PBV1 and PBV2 (one holds 5 mls, the other holds about 3)