Average Reviews:
(More customer reviews)The Penguin Bio-wheel pumps are great: quiet, effective and long-lasting. (I have a 170 filter in a 39 gallon tank.) These size C filters are widely available, but the Amazon price is much lower than at my not-so-nearby pet store.
A word of warning. The day after changing my filter three months ago fish started dying. Next morning my 6" long Plecostomus was dead. Then three Clown Loaches, each about 5 " long. Within a week I had lost 18 of my 20 fish. Yet there was no sign of disease.
A water test and much internet searching finally pointed out what I had done wrong. I had neglected my tank for a few weeks. In a rush to catch up, I siphoned out about 30 percent of the water (more than usual), did a "better" than usual job of siphoning up detritus from the gravel. Then - my biggest mistake - I replaced the Penguin filter too! The result is the water chemistry changed too quickly. The Nitrates spiked to a deadly level. My tank, healthy for more than two years, needed to be started over. Took two months and many water changes before I could safely add new fish.
I visited perhaps a dozen "fish forums" and only one had a comment saying "don't change filters when you do a water change.' The Penguin filters and the box they come in carry no warnings. What I (and you) should do is simple: space your water changes and filter changes a week or two apart.
Now knowing how important the "aged" filter is (especially in a tank like mine with no under gravel filter) I've started this habit: there's just enough space to get a second filter flat against the old filter. After a couple of weeks, I remove the older filter and put the newer one - by now doing some biological filtering - in its place. That way the tank is never depending on only a new filter. For larger tanks (say 55 gal and up), the 330 or 350 Penguin pump holds two filters side by side, so just change one filter at a time.
Hope this helps you avoid the disaster that hit my tank
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Product Description:
The Marineland Penguin Filter Cartridges are preassembled and filter water through a double thick polyfiber pad that traps more waste and dirt particles than conventional filter cartridges. The cartridge is packed with super-efficient pure Magnum Activated Carbon, so it keeps working long after most carbons stop to absorb harmful pollutants which discolor aquarium water and cause unwanted odors. It' better than a separate bag. The patented ribbed back design evenly distributes carbon for maximum water-to-carbon contact. No "tea bag" effect...just crystal clear, crystal clean water. Performs mechanical and chemical filtration.
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