guppies underground filter

My fancy guppy tank has been pretty stable, the last problem i had was when
i added a few guppies from the lfs and ended up with a disease in the tank
that was a few months ago, it got resolved back then and since been fine, a
months ago i added a underground filter to work with the HOB wisper thats on
it, when they have babies i turn down the flow a little so the fry dont get
sucked up, and i figured during that time the UG could pick up the slack, in
the past three weeks i lost 2 guppies, since they were 3 weeks apart, and
all the others look fine, i guess it could just be old age or something. Are
underground filter ok for guppy tanks, or not so good, i think the wisper
does a good job, i just noticed that during the time babies are born i
vacuum up more waste. with the UG filter the tank stays very clean, even
with the wisper turned down?
any thoughts
Nik

"Nikki" wrote in message
...
with the UG filter the tank stays very clean, even
with the wisper turned down?
any thoughts
===============
I got rid of all my UGFs years ago. The crud is hidden under the plates
where you can't see it rather in a sponge where it can be *removed* from the
system.
--
Koi-Lo.... frugal ponding since 1995...
Aquariums since 1952
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
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