Low oxygen?

[Midway]

I've been battling with high nitrates myself and I can tell you clowns can be very hardy and high nitrates are not gonna get to them at all, well for a short period of time though. If you keep high nitrates for a long period of time, not only clowns will be affected but all other fish as well.

How long did you guys have the clowns? Its pretty strange both clowns died at the same time. As i said before, those little guys can be and are pretty hardy, they can take a lot of abuse if they are healthy. My guess is they were already sick from before.