08-15-2012, 08:24 PM
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They are basically used to help keep fish poop and left over food from settling on the tank bottom, they are not needed but in my opinion on a large tank do help.
The ones I have go for about $24.99 Canadian, or about $23 Australian, so I would look at around that price. $90 seems an awful lot. You can always use Koralia powerheads as well, they can sometimes be cheaper, as they are used a lot in saltwater tanks and being in Australia then I suspect that is better supported than freshwater?
Another option to keep waste from settling is to look at installing an Under Gravel Jet system NOT an Under Gravel Filter. Here is an example, they are made out of pvc pipe and need a relatively small pump to power them. You can see examples here