I wouldn't... If too tight get a Hastur where you can change the airhole via air insertsI am actually considering giving mine to the husband and having him drill it out slightly. I mean I like the flavor and everything, and I worry it might affect that. It's just the only tank I have where if I draw on it, it can actually cause my implants to disconnect from my dentures. That strikes me as a bit, a smidge too tight...It does actually make me think I could use a little more air. But then I am worried about the flavor.... Decisions, decisions.
Anna
My 2c