Well what brand of liquidex is it? Is it the "real" liquidex in the 80mg bottle or is it GAC 30ml bottle or some other brand? There's some pics and posts in the gear pics board and couterfeit board.
I've heard the real liquidex is pretty thick. The biggest thing is you'll keep your bloat down during a cycle. That would be the true indicator, although I'd search the boards for pics. You may also want to check out www.anabolex.com for pics.
And one last thing, I'd ping LIBeef as he knows of one guy that was scammin people (although I think the guy never even shipped his stuff). Either way, pm him.