Thanks for the advice, everyone!

By the way, my massive weekly water changes are my attempt to keep the
cyanobacteria and algae from taking over my tank (it's been a losing battle
so far). Hopefully the protein skimmer will help. I've had it for a couple
of weeks now, and I'm cutting back to 20% weekly water changes.

Mer

"richard reynolds" wrote in message
.. .
sorry HOB == hang on back

the typical filter that sits on the back of the tank with a tube that
sucks water from the
tank and usually returns it through some kind of waterfall
pinguins,aquaclears, tetra has one, there simple, usually complete
filtration
(mechanical,chemical,biological) , generally good for FW tanks, there use
in SW is
specific to what kind of tank your keeping or interested in keeping.

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richard reynolds