white clouds dying!!!

I'm at a complete loss here. I setup a new tank recently. It's seeded from my large tank, so no real cycle. It has 2 honey gouramis, some brigs, and white clouds.

problem? white clouds keep DyING!!! I get them at petsmart. I don't usually buy fish there, it's usually pretty risky, but they're the only place that has them. I started with 10. Within 2 days I lost 3. got 3 more. That was Friday. Lost one over hte weekend, 1 last night, and now one is dying as I type this. I have NO idea what's wrong. Here's the params:

temp: 73 (they should be fine in anything below 75 from what I've read)
ammonia, nitrites, nitrates all at 0ppm (it's a planted tank). ph: 7.0

At first I thought it was jsut the luck of the draw coming from petsmart. Now I'm getting frustrated though.

any thoughts? I've never experienced this with any fish before. Everything says they're soooo hardy, yet this is NOT proving to be the case.

I jsut ran another batch of tests. My ph is actually 6.6. I guess the driftwood (which I jsut removed fearing it got contaminated somehow) has dropped it. This is still a reasonable number though. Also, the nitrates are up to 5ppm.

I got the 2nd 3 at a different petsmart. I don't know if they're some of the ones dying or not though. I can't tell :-(

make it 4 dead. I'm now down to 6.

so I guess I'll jsut leave them all to be for now and hope that when I get back from vacation in 1 1/2 weeks, there's at least those 3 from the other petsmart still alive. we shall see. I hope your right jpap. they're such bueatiful little things, I really want to be able to keep them!!