I don't never look for stocks to get in when they're down, not like that...
It's an ETF, too, not that they're all bad but they're also not all good.
Personally if I wanted to get into natural gas I'd look either into a miner, or something else.

Mostly...
For me they need to be in a consistent up trend of some sort, now then I might
wait for a correction so I can jump in on a down swing but we're talking a
swing that might last a week or a month, not years.