John,
If you would prefer to call a heavily planted tank "cycled" at all, in any
possible state, it might be more correct to consider it partially cycled
rather than temporarily cycled. After all, the tank would be cycled only to
the extent that the small quantity of ammonium left in the water column (after
the plants consumed most of it) would never permit a cycle large enough
(having sufficient populations of bacteria) to oxidize the amount of
ammonia/ammonium produced by the fish in a normally stocked tank in the plants
absence, if they were ever to be removed.
You are assuming correctly though, no matter terminology we use for the
cycle at this stage; with removing the plants and with the subsequent increase
in ammonia because of this, the tank would immediately start to go into a
regular cycle -- with the ammonia spiking near the 10 day period and the
nitrite spiking near the 20 day period before settling down. These time frames
and the levels of these spikes would depend directly on the number of plants
originally in the tank and the amount (percentage) of ammonia being produced
by the fish, that they were consuming.
Yes, aquatic plants preferring to eat ammonia and especially ammonium
rather than nitrate will also eat nitrite (only as a second choice) and prefer it
over nitrate as it's easier for them to convert nitrite to ammonium than it
would be to convert nitrate to ammonium. Some of those aquatic plants
having a preference for nitrate will consume nitrite, but not as their first
choice. There still are those plants that prefer nitrate rather than ammonia,
which prefer only nitrate -- and use very little (if ANY) nitrite. In a
working cycle, there is usually some nitrate present -- and in a quantity much
larger than that of nitrite -- unless the hobbyist does very large PWC's.
Ray.
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