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a couple questions


1)  Does anyone know what kind of plastic is used to make the clear, rigid
air lines and UGF lift tubes?

2)  How, after a plant has started "reaching" for light (and you fix the
lighting problem) do you get the plant to return to a low-growing habit?  

Finally, regarding the frequency of water changes.  Lots of people on the
list apparently go long periods without water changes, but these are
mostly experienced aquarists with dense and healthy plant growth in their
tanks. The plants (as in a natural water body) are tremendous water
purifiers. Without the experience and without good plant growth it's
probably a good idea to continue with regular partial water changes.

Roger Miller