Me and the wife acquired a 3L smirnoff bottle many years ago and its been sat in the loft ever since. With the talk of fish tanks in the pub thread got me thinking. I wonder if we could turn this 3L glass bottle into a mini fish tank. External pump and filter and some cold water fish. With the neck of the bottle being about an inch I can't put anything in it that will grow to big cause I'd have to mash it up to get it out if it dies. Any fish experts out there got any ideas, recommends on fish, pump filter or even its possible?