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[APD] Re: observations
I'm afraid I've never done what you said... but I'm curious what you mean
by a "biological" filter. A sponge filter is a bio filter. A wet dry is
a bio filter. A UGF is a bio filter. Certainly, a wet/dry is better than
a sponge, and a sponge is better than a UGF (at least IMO -- I'm sure you
could reverse the last two.).
In my experiences, tanks with UGF seem prone to hair algae and high
nitrates. Sponge filters are seldom used in plant tanks, and wet/dry
filters usually don't really support plants as well as tanks without.
This is probably due to the high level of co2-o2 exchange. On the other
hand, I've seen some beautiful plant tanks set up with UGF (I've actually
set these up myself) and with wet/dry. So, hard to say.
Just as a point, if there's a lot of bacteria populating the tank (whether
confined in the filter or not) they will compete with algae (and plants)
for nutrients... s you should see depressed plant growth, including algae
growth.... or so it would seem. This would be especially true since the
bacteria would have a decided advantage in a fitler, where -- presumably
-- there's no light for algae, and you don't grow plants in most
Wet dry filters are more commonly used in marine tanks. ANd I'll tell you
that they have absolutely no effect on the growth of algae in a marine
However, an algae scrubber makes a big difference, greatly decreasing it.
Joshua L. Wiegert
NFC Lists Administrator JLW at dune_net
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