Re: why not undergravel

In article <[EMAIL PROTECTED]>,
Dinky <[EMAIL PROTECTED]> wrote:
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><[EMAIL PROTECTED]> wrote in message
>news:[EMAIL PROTECTED]

>    If you simply use deeper gravel, the water will not flow well through
>it, and you've defeated the function of the UG anyway. Best filter for a
>planted tank is generally agreed upon to be the canister type.

I haven't seen a canister filter specifically for aquarium use.  I
imagine this is the most expensive route as well.  I can immediately
think of one obvious advantage:  you have an additional few gallons of 
water.  

I am picturing something like a Katadyn flow thru filter, with homemade
fittings and a pump, built into a 5 gallon bucket.  Even homemade, what
I'm thinking of would easily cost a couple hundred bucks.  But the water 
on the output side would be safe to drink...  

Seems like overkill.  I'm stuck with my choices for the time being.  I
think my gravel is deep enough, and I guess I have plenty of filtration
from the charcoal filter.  My fish seem to like bubbles...   Like I
said, it's cranked way, way down anyway.  I hadn't thought of the roots
being a problem, and it hadn't occurred to me that they would ever have
to move.  

Thanks!