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RE: Worms -- and substrate Oh too much O2?

Stephan said, in part:

> However in an aquatic environment plants are adapted to
> anaerobic substrates 

Well, this is confusing.  Substrate heaters promote gentle
currents to circulate nutrients. But there's O2 in the
water, so substrate heaters must bring O2 into the

Are plants in an equatic environment also adapted to
aerobic substrates?  If they can take it or leave it when
it comes to aerobics, what does it matter?

Scott H., who hasn't done aerobics for six months and
hasn't adapted to that at all well.

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