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[APD] Substrates and mulm in non-CO2 tanks

My current two tanks (35 and 125 gallons) are both set up as non-CO2 tanks,
with silica play sand over topsoil. I'm doing infrequent (every few months)
water changes.

My big complaint about this setup is that the play sand is fine enough that
the mulm sits on top of it. It accumulates around the plants, forms drifts,
and rises in clouds when bottom feeders swim though it. Plus, it looks
really ugly against the light-colored sand.

It's all annoying enough that I'm going to tear down and redo the tanks.
I'm trying to decide between Flourite and Onyx Sand. I like the look on
Onyx Sand better, but I'm concerned that I'll have the same problem with
mulm accumulations on top. At least with Flourite it should be coarse
enough for the mulm to settle between the grains.

Can anyone who has run non-CO2 tanks with the substrates comment on their
mulm experiences?

Jim Seidman

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